-> '''Pit:''' Why aren't my attacks doing more damage?!\\
'''Palutena:''' Well, it ''is'' a boss... \\
'''Pit:''' So annoying!
-->-- ''VideoGame/KidIcarusUprising'', "Chapter 9: Medusa's Final Battle"

First, let us say that he is not ThatOneBoss.

These bosses are not particularly difficult or dangerous, but an absolute pain in the ass to fight (one of the proposed titles for this trope was "Pain In The Boss", for this reason). Sure, your character may be able to last all day against this boss's attacks, but your patience certainly cannot. Frustration leading to mistakes is the most common way that players end up getting killed by these bosses.

In short, the Goddamned Boss is the boss equivalent of GoddamnedBats, while ThatOneBoss is the boss equivalent of DemonicSpiders. Or phrased another way, he's actually fairly easy to beat once you've seen through the annoyance factor, deciphered his attack pattern and come up with an effective counter-strategy.

Common traits of the Goddamned Boss include:
* Attacks that cause an InterfaceScrew.
* Attacks that [[PunchedAcrossTheRoom throw you to the other end of the arena]] or even out of it.
* A [[AttackItsWeakPoint weak spot]] nigh impossible to hit.
* Has a weak point [[ShieldedCoreBoss protected by a shield]], especially if the shield can be regenerated if taken down.
* Employs numerous StandardStatusEffects, especially ones such as Sleep or Confuse that impede your ability to control your character.
* Frequently [[CowardlyBoss runs]] or [[TeleportSpam teleports]] [[GetBackHereBoss out of attack range]].
* [[DamageSpongeBoss Incredibly high]] HitPoints. ''[[HealingFactor Regenerates]]'' its incredibly high hit points. Bonus points if it heals at a rate ''just under'' how fast you can damage it.
* Can heal itself up back to full in an instant, incredibly high hit points or not.
* [[BossBanter Taunts the player constantly]].
* Uses ManaBurn, ManaDrain, or some other form of PowerNullifier.
* Is sandwiched between long cutscenes or [[CheckPointStarvation a drought of]] {{Save Point}}s. The boss itself may not be much of a problem, but if you fail then you have to wait for a while before you can try to beat it again. You can go watch YouTube while waiting for some of these, but the worst ones require constant controller input.
* Moves with [[OverlyLongFightingAnimation very long animations]], so even if the damage is minimal, you have to sit through the animation every time the boss uses it.
* Is a FlunkyBoss, especially if the flunkies make it awkward to damage the boss itself without getting hit.
* The battle mechanics are [[FakeLongevity painfully repetitive]].
* Has access to ThatOneAttack which heals the boss or makes it invincible for a while, making the length of the fight dependent on how the AIRoulette is feeling that day.
* A TacticalSuicideBoss that has an attack that lets you hurt it, and rarely uses it, at random.
* By extension, a TennisBoss that can ''only'' be damaged by its Tactical Suicide move and forces the player to wait before it's used.
* Extended cutscenes in the middle of the fight where you can't hurt them, especially if they're triggered by how much health is left instead of time.
* If it's an optional boss, it may qualify as one of those if it's a major pain in the ass to summon him at all.
* If you're running a NewGamePlus, the boss can't simply be blazed through with your previous-run gear and items, while other bosses can be [[CurbStompBattle curb-stomped]] with comparatively little issue.

Sometimes overlaps with the MarathonBoss.

If this annoying yet easy boss occurs at a particularly plot-significant point, it may be seen as an AntiClimaxBoss. For bosses that are really frickin' hard ''beyond'' an annoyance factor, see ThatOneBoss.

!!!Own Pages
* ''GoddamnedBoss/MonsterHunter''


[[folder:Action Adventure]]
* ''Franchise/TheLegendOfZelda'':
** In ''[[VideoGame/TheLegendOfZeldaALinkToThePast A Link to the Past]]'', Moldorm from the Tower of Hera, the third dungeon. It fought you on top of a platform with open edges and a hole in the middle. And the KnockBack from hitting it in the wrong place would very, ''very'' likely send you plummeting down a floor (two floors if you fell down the hole in the middle). In which case you'd go back upstairs, pick up a heart or two, and realize ''the fight has started from the beginning.'' Any damage you did? ''Gone.'' It got faster the more damaged it got, making it more and more likely that it would knock you off and you'd lose more work.
** The Moldorm is the first boss of ''[[VideoGame/TheLegendOfZeldaLinksAwakening Link's Awakening]]'' and has pretty much the same schtick, but the frustration is slightly mitigated by the fact that you can now jump over it. The seventh boss is an evil eagle who likes to blow you off the tower and will also instantly regenerate if you fall off; this too can be mitigated if you [[spoiler: sequence break and get the Magic Rod from Turtle Rock before completing the 7th dungeon. It takes out the boss in 3 hits.]]
** The third form of Puppet Ganon in ''[[VideoGame/TheLegendOfZeldaTheWindWaker Wind Waker]]'' is basically Moldorm, except instead of the pits, it instead has a very specific weak point that you need to hit with a light arrow. Simple, right? Only, it moves around the ground ''very'' fast so that you'll have a hard time hitting it. It doesn't pose much of a threat to you, but it's still pretty damned annoying. There is a redeeming factor to this fight, however: the music. And the fact that [[spoiler:[[WeaksauceWeakness he's weak to bait.]]]]
** ''[[VideoGame/TheLegendOfZeldaSpiritTracks Spirit Tracks]]'':
*** Fraaz, especially in the final stretch. He switches between [[BarrierChangeBoss fire and ice]] attacks, and while charging up one, he is weak to the other, which can be exploited by using the boomerang to pick up the fire/ice left over from his previous attack and hit him with it. The thing is, this has to be done several times repeatedly in the last stretch, and if you're not quick enough or get hit with even one attack, you have to start the whole time-consuming process over again. To clarify, in order to complete the [[BossRush Take 'Em All On]] challenge and fight [[spoiler:[[BonusBoss Dark Link]]]], he has to be fought two extra times.
*** Malladus and Cole teaming up is annoying as hell. The damage you receive is minimal, but it's not a traditional boss fight like you'd expect. It's more an exercise in avoiding all of Cole's attacks as you steer Zelda up to where Malladus is using the stylus. While you're trying to do two things at once, Cole is throwing ghost mice at you that can stun you and take control of Zelda away from you, making you lose progress. And even more than that, the platforms start shifting as you get closer to the end, which can ''really'' throw you off.
** ''[[VideoGame/TheLegendOfZeldaTwilightPrincess Twilight Princess]]'':
*** That Twilit Bloat that is the last Tear of Light. First of all, it's electrified -- imagine the unholy union of Barinade from ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' and a gigantic tick. He flies, naturally. You're on this floating wooden platform in the middle of Lake Hylia, that ''of course'' tilts with your weight, and he can swim under it and knock you off. The only time you can attack him is after he tries to attack you (for a FULL HEART of damage -- and you only have five at this point), assuming you managed to both dodge him and are still close enough to reach him. And if you've managed to do this three times, you have to leap on top of him and attack his little tick legs all at once.
*** [[spoiler:Ganon's Puppet: Zelda]] is an interesting idea for a boss, and it's the first time we ever see this character fighting, but this boss cannot be attacked in any way... It's a TennisBoss and, damaging [[spoiler:her]] is entirely dependent on when the game decides "now's a good time to throw another energy ball that can be hit back".
** ''[[VideoGame/TheLegendOfZeldaBreathOfTheWild Breath of the Wild]]'' and its Thunderblight Ganon. Overall not a difficult boss, but his many little mechanics make it infuriating to fight him. Thunderblight is [[LightningBruiser infuriatingly fast]], making it difficult to get Perfect Dodges or even Shield Parries, and -- as the name implies -- can use electricity. Getting hit by electricity in this game means that Link drops his weapon. All of this gets worse when it gets to lower HP and not only electrifies its sword and shield, but also begins to drop metal rods around Link and have them act as lightning rods.
* Judge Doom, the FinalBoss of ''Film/WhoFramedRogerRabbit'', is easily hit and can't really hit you effectively, but his stamina is far beyond absurd. Worse, when he's been knocked down and you have a chance to finish him off with a can of Dip, Judge Doom inexplicably gains the ability to kill you with ''one hit!''
* The Mother Monster from ''VideoGame/CrusaderOfCenty'' just sits there without doing anything whatsoever. It is easy to kill if you know which of the (couple of dozen) weapons you're supposed to be using, but of course [[GuideDangIt there's no hint]] as to what that might be. Use anything else, and you can just whack at her for half an hour without accomplishing much.
* In ''VideoGame/CaveStory'', the game's True Final Boss, [[spoiler:Ballos]]. He's definitely hard, and interesting, but not hard enough to count as ThatOneBoss (as in, not hard enough by TrueFinalBoss standards). No, he's a GoddamnedBoss because to get to him you have to go through the long BonusLevelOfHell, which is hard enough by itself, and fight ANOTHER challenging boss immediately before it '''without''' saving or using the full-heal boxes. To quote [[WebAnimation/ZeroPunctuation Yahtzee]], it's like eating an entire bucket of corn on the cob without getting a kernel stuck in your teeth.
* In ''VideoGame/ShadowOfTheColossus'', several of the Colossi may fit this role:
** Avion is one of the first that comes to mind. To defeat it, you first have to get on top of it, which requires you to wait around until it gets near you and then execute a perfectly aimed and timed jump when it does. You lose your grip (and the ability to attack) whenever Avion makes a mid-air turn, which it spends most of the battle doing. If you fall (and you will), you have to swim all the way back across the huge lake-arena via a lazy breast stroke, which is frustratingly slow and takes an enormous amount of time.
** Pelagia is also incredibly tedious to fight. The idea is to use Pelagia's lip to jump up to the top of a small building so it will put it's forefeet on the roof, exposing the weak point. Everything from getting it's attention close enough to the building to jump to it, succeeding in jumping to it's lip, succeeding in jumping to the ''building'', and making the jump to it's weak point is absolutely ''maddening''.
** Basaran, if only because getting it to stand over a geyser -- and have it ''centered'' so that it actually hits it -- can be a pain to accomplish.
* ''VideoGame/LaMulana'':
** [[FlunkyBoss Baphomet]] could definitely qualify for a Goddamned Boss. While he doesn't have all that much health, and bombs (his primary weakness) do damage even if his wings are closed, the [[GoddamnedBats witches]] are what make this battle infuriating. There are about 4 witches on the screen at a time, and they vary from white (lightning bolts if you're in their field of vision), green (shoots fireball that goes through walls), light red (fast, shoot a large energy ball), and the most infuriating, gray. They're slow, but they fire a projectile that goes through walls and stuns you after the knockback (even in midair), which have a nasty tendency to hit you while you're trying to jump onto the main platform. Those gray witches will make you wish you were able to [[BurnTheWitch burn them]]. Also, he has a few attacks that are hard to dodge.
** Bahamut is even more annoying. You fight him in a tiny-ass boat that drifts back and forth across the screen. You can't control it, only being able to influence its speed. Bahamut, meanwhile, will pop out of the water on the left and right sides and either charge you, breathe fire, or spit projectiles. If the boat drifts over him, you're going in the water, which hurts you even if you have the Scalesphere, and God help you if you get stuck under the boat.
** Tiamat, oh boy. Her room has four infinity symbols that can be destroyed, and it's highly recommended that you do. If you don't, she attacks with her hair in 8 fixed directions (and they're in an awkward offset) making it almost impossible to get close to her for a respectable amount of time to hit her. Not only that, she spawns GoddamnBats which increase in number over time.
** All of those pale in comparison to Ba, a miniboss in the Confusion Gate. Ba is essentially [[VideoGame/TheLegendOfZeldaALinkToThePast Moldorm]] from hell. You fight him in a room lined with spikes and filled with very tiny platforms. Being a giant bat, all Ba does is fly around randomly and occasionally spit a single projectile at you. However, the knockback from any hit will send you flying off the platform and down one screen, refilling Ba's health. Unlike Moldorm, however, getting back to Ba is not as easy as just climbing back up. There's a few ways, but if you don't know how to do it, you may well be climbing ''all the way back up the Tower of the Goddess''. It's one of the few puzzles in the game where the [[AwesomeButImpractical pistol]] would come in handy...except it's a puzzle you have to solve to open the door to where the pistol is hidden. Blargh.
* ''VideoGame/NoMoreHeroes2DesperateStruggle'':
** One particularly annoying boss is [[spoiler:New Destroyman]]. The fight consists entirely of the red one fighting you up front and the blue one standing on the catwalks above shooting at you. You're supposed to position yourself so the blue one's attacks hit the red one, but occasionally, the attack will outright go around the red one to make sure it hits you. Once you kill the red one, it then degrades to grave-camping, as you basically just wait for the blue one to come revive him, the only opportunity you'll have to hit him.
** The other Shinobu boss, Million Gunman, is pretty frustrating as well. He's a GetBackHereBoss who will [[UnnecessaryCombatRoll dodge roll]] out of any attempt to directly attack him, moves around a multi-tiered stage really fast at random, forcing the player to rely on [[ScrappyMechanic Shinobu's jumping mechanics]] to even get close to him. He's also somewhat of a MarathonBoss, as he takes a very small number of hits before taking off again, and can knock back the player with his fairly powerful projectile attack. [[ArsonMurderAndJaywalking And he doesn't]] [[MostAnnoyingSound shut the hell up]].
** Hell, ANY Shinobu fight can become this due to her overly annoying habit of stopping to taunt after every single combo, meaning she's about half the speed of Travis or [[spoiler:Sir Henry]], which makes her the worst character to play as.
* The Spore Spawn in ''VideoGame/SuperMetroid'' is an elaborate test of patience and jarringly slow paced compared to the other fights. Most of the fight is spent dodging falling pollen and its body just waiting for it to open up and show its weak point (there's a strategy to easily dodge this, [[GuideDangIt but still]]. Luckily, you can completely skip it with a little SequenceBreaking, even in a HundredPercentCompletion run.
* The BonusBoss of VideoGame/{{Poacher}}. His first form is a DamageSpongeBoss that likes to [[BulletHell fill the screen with bullets]], but that's only the beginning -- both of his other two forms are fought while jumping across small platforms above the only BottomlessPit in the game. Any and all damage you take causes knockback and locks up your controls until you hit solid ground. All three forms have to be defeated without saving, and even after that, there's a good stretch of rooms covered in spikes between you and the next save point. Do the math.
* ''VideoGame/CastlevaniaIIIDraculasCurse'' has two rather nasty instances of this:
** The Cyclops, whose for some reason can only be damaged by hitting its eye. It walks left and right, forcing you to constantly outrun it across the screen repeatedly until you get that split second of time in which to AttackItsWeakPoint. What makes it especially frustrating is that if you don't keep just the right amount of distance, it will sprint towards you, closing in on you and forcing you to waste even more time running away. Luckily, there are a few items and spells that make the Cyclops a bit less of a chore to deal with, such as the [[NotCompletelyUseless Knife]], [[AnAxeToGrind Axe]], and [[GameBreaker Sypha's Lightning]].
** The Water Dragons from [[ThatOneLevel Level 6]] are a combination of this and ThatOneBoss. Thanks to the BottomlessPit [[SuperDrowningSkills river]] making their fire breath {{knockback}} a guaranteed OneHitKO, the player is forced to stand on the middle platform and very carefully move to the left and right edges and crouch accordingly. In order to defeat the dragons in a way in which you'll actually survive, you have to patiently wait for one of the dragon's heads to be at a position where you can hit it with the Axe, or repeatedly turbo-fire your whip in the hopes it'll make contact with one on its way down. And of course, each hit only deals 1/16 of the boss' life bar in traditional ''Franchise/{{Castlevania}}'' fashion. It's one of the rare cases where even the [[TimedMission timer]] can kill you in a ''Castlevania'' game.
* ''VideoGame/CastlevaniaOrderOfEcclesia'' on a NewGamePlus has Brachyura. Unlike other bosses, who you can simply rip to shreds with your carried-over glyphs, Brachyura is invincible for the entirety of the fixed-pace tower climb, only killed when it and Shanoa reach the top. At best, he drags on compared to the other bosses. At worst, getting his [[FlawlessVictory medal]] is a test of patience that will most likely dwindle with each re-attempt.
* Cro-Maine, one of the later bosses in ''VideoGame/EVOSearchForEden'' is the bane of anyone who plays this game. Not only does his attack do a lot of damage ''and'' has a huge swing radius, but one hit sends you clear out of the boss arena and forces you to start from the beginning. [[TheComputerIsACheatingBastard Note that his health is fully restored but yours isn't.]] Unlike every other boss in the game where there is always an evolution to give you an edge, your only hope against Cro-Maine is to carefully time your attacks so you can dodge his club and chip away at his health, and one slip up sends you all the way back to the start of the fight.
* ''VideoGame/{{NiGHTS}}:Journey of Dreams'': Bomamba is a PuzzleBoss with an immediately obvious solution, yet still manages to be absolutely infuriating. What you need to do is grab onto the pegs and tilt the board to roll her [[FlunkyBoss little cat flunkies]] into the holes, but the controls for tilting the board are ''atrocious'', and in order to dodge her otherwise slow and heavily telegraphed attacks you need to move to a different peg and then resume the puzzle from a different perspective. This would be annoying enough on its own, but this in this game [[TimedBoss your time is your health]], meaning each time you take a hit you have less time to complete the puzzle, and as you waste more time on the puzzle you can't afford to take as many hits.
* Venom from ''VideoGame/SpiderMan'' will ''really'' get on the nerves of players, particularly those on a first-time playthrough who haven't mastered the decent but often dodgy controls. You first have to chase him across the city and battle him in an alley, with his favorite attacks being [[TeleportSpam vanishing and teleporting]] and a difficult to avoid attack that amounts to just grabbing and immobilizing you for five straight annoying seconds. Then you get to do the same chase through the sewers, and ''then'' the same battle except with [[DamselInDistress Mary Jane]] dangling in a tank with a "fill" switch that Venom keeps flipping on. It doesn't help either that Venom [[BossBanter never once shuts up]] throughout the entire 45 minute or so segment.
* ''VideoGame/UltimateSpiderMan'' has a lot of challenging boss battles, but they're mostly [[ThatOneBoss hard in a good way]]. Then there's the second Silver Sable fight. First of all, Sable only gets hurt from the first couple of hits each time, then she just starts auto-blocking and you have to move away and wait until she's vulnerable again, which results in the battle getting very monotonous. To make things harder, she constantly leaps around the area, all the while you're robbed of your webshooters and can only run and jump. Not to mention Sable attacks in combos only, and [[FlunkyBoss has her troops constantly distract and annoy you further]]. The redeeming factor is that the fight is fairly short and ends once you bring Sable's health down to a certain point.
* Gir-Tab in ''VideoGame/AxiomVerge'' starts as a pretty easy fight. You just have to damage its underside and its projectiles are trivially easy to dodge. Then it lays flat on its underside. Its attacks become more difficult to avoid and it's basically invulnerable. Then you realize it can do this whenever it wants.

[[folder:Action Game]]
* In ''VideoGame/GodOfWarIII'', there is truly one that is not difficult to kill (On easy or normal mode...), but hard to fight. The Cerberus/Satyr fight in the underworld. The monster dog does a number of things to simply drive you insane. First, it spawns smaller dogs that explode, up to three at a time. Sure, you can kick them back at the Cerberus if you are lucky. It has a three prong massive fire attack, which, while easy to avoid, is unblockable; last but not least, it uses its claws to swipe away your health, but this is easy to avoid. After you tear off one head is when things get interesting. Now a Satyr shows up to help. If you manage to kill it and tear off another dog head, TWO more of these things show up! So now you have serious problem. This boss is the Goddammed boss of the game when played on Titan mode or above. Apparently, you are supposed to use Hermes' Boots to help with the battle according to Youtube, but locking on to the right enemy is far from easy; most of the time, you'll end up locking on to one of the exploding dogs instead, very frustrating. Satyrs being the series-long DemonicSpider doesn't help.
* [[Franchise/DevilMayCry Devil May Cry 4]] has a terrible boss in the form of the first fight against Agnus (or rather, the glass window blocking him from you). Waves of Gladius fly out, and you're supposed to grab them and use them to break the glass. On lower difficulties it's not too bad, but on higher ones it's a nightmare. In theory you're supposed to grab a Gladius before it attacks you - or just shoot it and then grab another - whilst dodging the ones you can't. In practice, your lock-on controls won't know which Gladius you want, they attack fast enough that you can only dodge so much, the floor constantly charges with electricity so you're limited by your dodging space, and it's entirely possible to be stun-locked and lose half of your health in one go.

[[folder:Beat Em Up]]
* ''VideoGame/StreetsOfRage 3'', the end boss of Stage 4: the mysterious samurai ninja robot(?) named Yamato. He splits into three separate entities (of which, chivalrously, only one will face you at a time), with ''four life bars each.'' His default behavior is to keep his distance and wait for the player to make a move (or throw flaming shuriken at a passive opponent). When you get too close, he'll either immediately make a flying leap to the other side of the arena or run you through with a lightning-fast sword dash. If you back him into a corner, he'll either FlashStep right behind you for another slash-dash or turn briefly invincible and run over anything between him and the opposing corner of the arena. He has some other tactics too, such as turning briefly invisible and throwing shuriken in triples or splitting into two unhittable mirror images that symmetrically dash through everything in the upper and lower edges of the area. However, with a lot of practice, finding weaknesses, and goading him into doing just those things that leave openings for attack, he gets simple and he turns into a slightly more arduous MarathonBoss.
* Carrion from ''Spider-Man and Venom: VideoGame/MaximumCarnage'' isn't particularly strong or durable, but is annoying due to his ability to levitate and turn intangible.
* ''VideoGame/RiverCityRansom'' has one of the really early bosses: Moose. The problem isn't him, [[WarmUpBoss as the first boss he's a pushover]], the real problem is his stage. If you don't watch your footing, before you beat him you'll plunge into the huge pit that takes up most of the Construction Site and instantly die, and then have to run all the way back to the Construction Site, mop up all the mooks there, and finally fight Moose again.
* In ''VideoGame/StreetPassMiiPlaza'''s ''Battleground Z''/''[=StreetPass=] Zombies'', [[DualBoss Bubba and Cleetus Rotts]] can't really harm you that much, but they use a combination of throwing you out into the far edges of their cornfield and sending endless numbers of fast-moving zombie dogs at you. If you don't yet know their attack patterns, you'll spend more time going back to the center of the cornfield, while fighting off their dogs, than actually fighting them.

[[folder:Fighting Game]]
* Bloody Marie from ''VideoGame/{{Skullgirls}}''. Her attacks do good damage, but are blockable, and she isn't too over-powered, particularly her first two forms. Her third form is highly annoying due to her attacking more than the first two forms and she tends to run away, as well as being immune to most ground attacks.

[[folder:First Person Shooter]]
* ''VideoGame/MetroidPrimeTrilogy'':
** Depending on your weapons, the [[InvisibleMonsters Cloaked Drone]] in ''VideoGame/MetroidPrime'' can be either a piece of cake or an aggravating encounter. If you took a detour and found the Wavebuster: congratulations! The Wavebuster automatically latches onto the Cloaked Drone and destroys it in three seconds flat. If you didn't, however, prepare for pain. It can't be locked onto, and the Thermal Visor doesn't help. It's very possible for first-time players to waste time trying to scan it to no avail and take more damage than necessary. With no way to lock on, trying to shoot it becomes frustrating because you can't manually aim and run around at the same time, or you have to lock your view to one specific point and try to meet the Cloaked Drone with your shots. [[note]]''Metroid Prime Trilogy's'' aiming scheme alleviates this issue.[[/note]] In the meanwhile, it's constantly peppering you with powerful shots and just ''won't stay still.'' To top it all off, the Cloaked Drone is at the end of [[ThatOneLevel 'The Gauntlet']] and is guarding the one save room you've been trying to find for the past hour. Dying to it makes it even more aggravating.
*** The eponymous creature's 2nd form is this. It's completely immune to everything except the Phazon Beam, which can only be used if you stand in a pool of liquid phazon. Where are these pools? Prime excretes them occasionally. Prime's phazon excretion is completely random, though, meaning you may end up jumping over shockwaves for way longer than is reasonable before you can finally hurt her. Oh, and each Phazon Beam shot only lowers her HP by 1/8.
*** The first form of Prime is just as annoying. It's only vulnerable to certain beam weapons at a time, which is fine. The problem is that in the last quarter of the fight, it changes its vulnerability very quickly, and some of your beam weapons are ''not'' fast-moving. By the time your Ice or Wave Beam has reached Prime to hit, it could've changed its vulnerability one or two times, making the shot ineffective. Combined with the Plasma Beam's relatively short range, the only weapon that can do consistent damage is the Power Beam, and even then, you'll be lucky if you can hit it more than a few times before it changes vulnerability again. How serious is this problem? On harder difficulties, you'll see it change vulnerabilities nine times in as many seconds. Combined with the fact that in this phase it gains no new attacks, it just drags the fight out much longer than is reasonable. It also starts spamming its ramming attack, which is just a giant pain in the ass.
*** Meta Ridley, the penultimate boss of the first game, usually doesn't strike many people as intensely annoying simply because of how ''fun'' he is--however, he does dip into this a bit. Every so often he starts flying outside of your shooting range for a while and when he lands on the temple, produces a shockwave that is barely visible and is for some reason very difficult to dodge. At 1/5 health is where things get dicey: he lands, loses his wings, and starts ''utterly spamming'' his ridiculously damaging, accurate, and hard to dodge ram attack. On higher difficulties, this can shift to ThatOneBoss instead of this trope, as the annoying factors are less visible past the overall difficulty.
** The last Dark Samus battle in ''VideoGame/MetroidPrime2Echoes'' is a giant exercise in frustration not because she's difficult, but because there's a seven minute time limit and the damage calculators are set so that she takes very little damage on the rare chances you have of hitting her. So for most of that seven minutes you're just helplessly staring at her cheap invincibility waiting for her to take her sweet time to give you a chance to hit her. Incidentally, this is only on hard mode. The damage calculators on normal mode are such that beating her is much less of a chore.
*** Despite being much easier, the first Dark Samus battle is a pain near the end. Dark Samus starts shielding near the end, making it impossible to hit her while she's using one of her attacks. However, when she's not attacking, she's zipping around the room so fast you can't keep a lock on her. So basically, the only way to do it is to just spray the room with Power Beam shots and hope they hit her. While she only has about a quarter of her health left when she does this, it's a pain because the fight just drags on and on.
*** The Grapple Guardian also has the potential to be a major pain in the ass, just because it's so hard to effectively stun him to get good hits.
** The second phase of the final battle in ''VideoGame/MetroidPrime3Corruption'' takes a really long time, about twice the other two phases put together, but is substantially more mechanical and less fun. You're most likely to screw it up because you get impatient with how it's taking forever.
*** Mogenar from takes almost an hour to beat on Hyper difficulty. His only weaknesses {orbs on his shoulders, stomach, and back) are shielded 75% of the time, and heal over time. Then if you do wind up destroying one, he stops and grabs another one to heal himself. The fight itself isn't that challenging, just long and stupidly annoying. It doesn't help that you only have the Power Beam in this fight and it's early in the game so you're low on health anyway. The kicker is, that to actually cause real damage to it, you have to jump into Hypermode once the orb is white, shoot it with the Hyper Beam (which saps your health), and use it ''really quickly'' so it doesn't go for the recovery orbs.
*** ''Prime 3'' also has the Korakk Beast, a miniboss that takes an absurd amount of time to defeat. The pattern to defeating it includes shooting its tongue when it shoots it out, rolling into the Morph Ball, rolling under it, and planting a bomb under its stomach, then rolling out and shooting it in the stomach during the short window you have to do so. It takes a fair amount of damage, but also deals a fair amount as well, and moves around at a quick enough pace.
*** The Metroid Hatcher. It's really hard to hit because it not only moves quickly, but it has to be shot in the tips of its quickly-moving tentacles to make it vulnerable. It also has a hard-to-dodge spinning attack, and if you don't attack it when all its tentacles have been shot, it'll spawn Metroids. These Metroids make the fight much more difficult. If you don't attack the Hatcher quickly enough when it's vulnerable, it'll draw out the tentacles and you have to start all over. (At least when a tentacle is torn off, it means one less tentacle in the process.) Fortunately, you only have to fight one the hard way. The other two can be easily handled with the [[AttackItsWeakPoint X-Ray Visor]] and [[OneHitKill Nova Beam]].
** Slench 3 in ''VideoGame/MetroidPrimeHunters''. Oh my, where do I begin talking about it?
*** Its main attack is the [[InterfaceScrew Volt Driver]].
*** [[FlunkyBoss Has "Turrets" that it can control]] while attached to the wall, and those flunkies uses his same main attack. There are three of those.
*** Comes after a true and long PlatformHell which, as you guessed, you will have to do on the way back.
*** [[ShieldedCoreBoss Cannot be hurt]] while docked or preparing to tackle Samus.
*** [[FakeLongevity Docks every time it loses a third of its health.]]
*** The [[AttackItsWeakPoint small weak spot]] is only fully exposed when not docked.
*** [[CowardlyBoss Moves around a lot]] when not docked and, as expected, only stops to ram into Samus. And of course cannot be hurt while preparing to or ramming.
*** Although this doesn't account to 'Goddamned Boss', he can only be hurt by the [[GrenadeLauncher Battlehammer]].
* ''VideoGame/HalfLife2'':
** The Gunship battles are this if you don't understand how the rocket launcher works, which many players do not thanks to the only explanation being by Colonel Cubbage at a time when you might not even be anywhere near him.
** To a lesser extent, Striders, but they don't move as much and don't shoot down your rockets.
** The final boss of ''Opposing Force''. The pattern is simple: shoot out his eyes with the cannons, fire into the portal in his stomach, kill the Shock Trooper he spawns, then repeat. There's barely any challenge; by this stage of the game, one Shock Trooper is barely a threat, the boss's attacks are telegraphed way in advance, and there's a health pool in the other room, safe from anything the boss can throw at you. However, the collision detection for the portal in his stomach is very fiddly, and there's no way to tell if you're actually doing anything until the boss dies, which usually takes a while.
** The invading Striders at the end of Episode 2: the only quick way to defeat them is to either hit them with three rockets or latch a Magnusson Bomb to them and detonate it. You're given plenty of practice with this method beforehand and the base you have to protect has some decent rocket turrets and Vortigaunts which can hold off a couple if they slip through, but what makes it annoying is that every Strider is accompanied by at least 3 Hunters, which will shoot down rockets and bombs if you try to attack the Strider before dealing with them. You can also only carry a single bomb in your car, so if they shoot one down while you're far from a resupply point (or the one you're using gets destroyed) and you're out of rockets you need to backtrack all the way to another to get another shot at it.
* Wilhelm in ''VideoGame/{{Borderlands2}}'' is this for many players. A giant robot with many hard to avoid attacks and can summon lesser robots to either annoy and distract you or to get his shield recharged unless you [[ShootTheMedicFirst blast them quickly]]. Even with a strong corrosive weapon, Wilhelm has a ton of health. Don't let the boss catch you near the arena's cliff edge because he can push you over it and instantly kill you, causing his health and shield to be ''fully restored'' because you died. The only way to avoid that is to play with other people, since boss characters cannot regain health unless the entire group is taken out in one swoop.
** Saturn manages to be even worse, being encountered in an area where pools of slag will make you vulnerable to damage if you step on them (and is very easy to do on accident) and while cover is available, he's so tall he can shoot over most of it anyway. It does get easier once you shoot out his many turrets, but then it just becomes an attrition fight of finding cover from his missile attack, dealing as much damage as possible, and dive back in.
** An optional [[BonusBoss Raid Boss]], called "Terramorphous the Invincible" can be fought initially as a side mission after the end of the original campaign. As a Raid Boss, he is not that difficult if you are a few levels above him. However, he is made to be fought first in [[NewGamePlus True Vault Hunter Mode]] with ''four'' level 50 characters at the same time. On top of that he has a slapping attack which, if standing in the wrong place, can toss you out of the arena into a deep chasm. However, there is an area in the arena where most of his attacks can't reach. If the player can find that spot, the fight should be much easier.

[[folder:Hack And Slash]]
* ''[[VideoGame/{{Diablo}} Diablo II]]: Lord Of Destruction'':
** The FinalBoss, Baal. He teleports, [[ManaBurn burns mana]], creates clones of himself, casts spells that can push you nearly a full screen back, and has a [[ArsonMurderAndJaywalking rather annoying laugh.]]
** There's also Nihlathak, the boss of the aptly named Nihlathak's Temple. He [[MookMaker spawns minions]] and uses a [[ThatOneAttack devastating corpse explosion]] attack on downed minions.
** And then there's Izual. He doesn't hit that hard and you can life leech it back quickly, but has [[DamageSpongeBoss so freaking many HP]] that the recommended method to kill him as a melee class is to ''weigh down your attack key and go for a snack.''
** Blood Raven, who [[GetBackHereBoss constantly runs around]] [[SuperSpeed at breakneck speed]] while [[MookMaker summoning tons of zombies]] [[GoddamnedBats that get in your way]].
* Alpha Azieru in ''VideoGame/DynastyWarriorsGundam 2''. It's not [[ThatOneBoss Devil Gundam]]-level difficult, but if you're in the wrong place, the goddamn funnels will hit you no matter where you try to move, sometimes three or four times in a row. It can shave off quite a bit of your health in the process.
* The Hydra in ''[[VideoGame/WarriorsOrochi Warriors Orochi 3]]'' isn't difficult. It can only be fought with the Yashio'ri cannon and its attacks are easy to avoid. What makes it such a drag is that you have to wait a ridiculously long amount of time for the main beam attack to recharge and the right moment to fire it. At best, it will only take three shots to destroy one head, but this still takes at least a minute. In one battle, you have to destroy ''eight'' heads.
* The Undead Pirate Captain in ''[[VideoGame/BaldursGateDarkAlliance Baldur's Gate: Dark Alliance 2]]'' has many health points, can deliver average (but not excessive) damage, and resurrects his undead henchmen, meaning that you'll have to deal with them again. The only advantaged character is Alessia [[LightEmUp the cleric]], who can use TurnUndead to wipe them out and destroy their corpses.
* ''VideoGame/HyruleWarriors'':
** Gohma. It's invulnerable except if hit with a specific attack when you see an opening (to be fair, an easily-identifiable one), and is under no obligation to use the attack that exposes the opening. The attacks that ''do'' qualify do a large amount of damage and have a wide range. The attacks that ''don't'' do a large amount of damage and have a wide range. And the bastard's fast. ''Do not'' let it get a morale boost in Adventure Mode, or it will quickly rise to ThatOneBoss.
** Manhandla. Like Gohma, it's impossible to damage unless you hit it when it exposes its weak point with a specific item. ''Unlike'' Gohma, Manhandla has ''four'' heads that must all be taken out to reveal its weak point, it reveals its weak point more rarely (Gohma has an opening after nearly ever attack; Manhandla only has one after two specific attacks, one which only lets you take out the heads one at a time), and the weapon you have to use to make it vulnerable (the boomerang) has a relatively small range, forcing you to get close. What's worse, it has several wide-range attacks, making it very difficult to avoid taking some damage while you try to get close enough to attack it. [[spoiler:There is some alleviation to this however. While most of the time it does require all four heads to be taken down, the player can occasionally catch a break and get the plant mass vulnerable by knocking out three or even just two. It seems to be luck based however, if not just a glitch entirely.]]
** King Dodongo is by no means difficult to defeat- most characters are able to one-round his weak point, even if they are unable to against other bosses. The annoying bit is revealing this weak point: King Dodongo has a massive array of attacks that he can use regardless of health, and only ''one'' will expose his weakpoint. For reference, most other bosses have two or three attacks that expose their weak points, and the attacks that don't tend to appear once the boss has [[TurnsRed lost some health]]. If you don't have a Focus Spirit to reveal Dodongo's weakpoint immediately and/or are using a warrior that isn't powerful enough to defeat him in one weak-point strike... prepare to take a while.

* Monk bosses in ''VideoGame/GuildWars'' have an unfortunate tendency to be able to heal themselves very quickly, making it difficult to do enough damage to kill them. And Dwayna help you if there's another monk enemy in the boss's spawn. One of the worst is a mission where there is a Monk boss and a Mesmer boss (crowd control and interrupts) together. Neither does a large amount of damage, but one makes it hard attack properly while the other heals what attacks do get through.
* ''VideoGame/GuildWars2'' has Jade Maw and Cairn the Indomitable.
** Jade Maw is an obnoxious pseudo-Lovecraftian squid that can only be hurt by hucking charged crystals at it - crystals that can only be obtained by killing its GoddamnedBats flunkies and charged by using them to soak up a massively telegraphed OneHitKill move. Not hard, just a tedious, annoying fight.
** Cairn The Indomitable is GoddamnedBats, the Raid Encounter. He throws the raid team all over the place. Throughout the fight you get a stacking debuff that makes you slower, he tosses you into the air inflicting more stacks of the debuff, shoots projectiles that knock you all over the place, teleports you all over the field and swings around a giant crystal club that launches you off the platform. Just when you get used to all that, he starts in with a shockwave of crystal that - if you couldn't guess by now - launches you all over the place. Oh, and if that weren't enough, all these attacks interrupt your moves, and with the projectiles, the recovery time is just barely shorter than the interval between them (so you don't suffer StunLock, but come so close you go insane.) Despite all these absolutely infuriating mechanics, he's regarded as probably the easiest real raid boss (after [=McLeod=] the Silent who's basically an overgrown EliteMook).
* In ''VideoGame/CityOfHeroes'', Reichsman has 225,000 hit points. A team without regeneration and/or resistance debuffs is in for a loooong fight.
** Actually, he does not regenerate his health. However in the villain version of his task force, he has a phase-shift power that makes him impossible to damage and he cycles in and out of phase. If you didn't bring a Mastermind class on your team (or lost the Mastermind player for any reason), you cannot get the temporary power that neutralizes this ability.
* ''VideoGame/WorldOfWarcraft'':
** Mr. Smite, the Prophet Tharon'ja, King Ymiron, and other bosses who pause the action before changing their attack pattern. Very frustrating the first time around if you just blew your cooldowns, with better gear merely annoying to wait most of the fight on the pauses because the boss just loses HP that quickly. Ymiron has ''four'' pauses like that.
** You can wipe on Heroic Pit of Saron on Garfrost because you did too much damage for him to throw the saronite you hide behind. In Lich King anyways.
** Razorgore in Blackwing Lair has become this now that players are high enough level that he's no longer a threat. You have to force him to destroy the eggs before you can kill him, so while his HP is insignificant by Cataclysm standards, you have to sit through a fairly long and tedious process if you're not the controller, killing adds that require hardly any effort if you're past their level range.
** Asira Dawnslayer in Hour of Twilight is not particularly difficult, but periodically throws down smoke bombs that make it impossible to attack her while she and/or you are in the smoke, and if you're a caster, casting a spell will result in her throwing a knife to silence you.
** Echo of Kros is the easiest of the summonable Champion bosses on the Isle of Thunder, but it can summon spirit raptors that can silence you, can do a roar that fears players, and can summon an add that will heal it if it reaches the add.
** Progress on raid bosses in general tends to include a certain number of wipes, some more than others (and generally speaking more wipes the further you get into the raid), in order for the group to learn how to properly handle mechanics. Every once in a while, however, you will run into a long endurance boss where most of the challenge is back-loaded to the final portion of the fight. This means you can get the first 7 minutes of the fight down in only a few tries and then spend the rest of the night repeating that portion effortlessly only to wipe at 10%, qualifying the boss in question as this trope. Some of the more infamous cases of this are Sindragosa in Icecrown and the multi boss fight Iron Maidens in Blackrock Foundry. The latter in particular, where ''three'' new mechanics activated whenever one of them falls below 20% health along with gaining a damage buff for the rest of the fight that stacks up over time, eventually overwhelming you if too many damage dealers get caught out by one of the numerous danger zones.

* ''VideoGame/PerfectWorld'' has Kun Kun, a boss who is a [[DirtyCoward huge coward]] and so [[AntiClimaxBoss doesn't attack at all]], [[GetBackHereBoss only running away]]. He also has [[AntiMagic full spell immunity]] and absurdly high physical defense. He really isn't a problem for most classes (Melee classes and Archers just smack/shoot him to death, Venomancers sic their pets on him, Clerics use Plume Shot and their other physical attacks), but Wizards and Psychics have to run up and physically smack him with their wands/soulspheres for 3-4 damage per hit. Another complaint is that he tends to run straight into groups of aggressive mobs. This is obviously another problem for [[SquishyWizard Wizards and Psychics]], but also for melee classes because most of the mobs in Kun Kun's area are casters and heavy armor does not protect very well against magic, sacrificing magic defense for physical defense.
* ''VideoGame/DCUniverseOnline'' has Harley Quinn, Complete with two different mallet attacks that will knock you across the room for massive damages, stun and ground attacks that cripple most ways of dodging her, even better she can't be harmed DURING the mallet attacks that are annoyingly long with annoyingly short periods between them to actually hit her! Once you figure out the cues to her attacks you can stay out of the way then rush in to hit her before running off again, but it's still a long fight. BONUS, she comes in two modes, normal and Challenge once you hit Level Cap...have fun!
* End-game bosses in ''VideoGame/{{Aion}}'' tend to have the Recovery ability, which is an uninterruptable attack that restores usually about 1/6th to 1/5th of their HP. Because they can use it without fail, and thanks to AIRoulette, they can use it back-to-back, a party that's capable of beating the boss normally will quickly find their patience running out when the boss heals almost back to full while they can do nothing about it, even if the boss is in the same situation (i.e. unable to kill the party). The accepted and understood method of killing these bosses is just to do damage fast enough that Recovery just drags the fight out, as opposed to making it unwinnable.
* In ''VideoGame/ChampionsOnline'', there's Viperia in the Serpent Lantern missions. Literally invulnerable after the first few hits, you have to defeat her by basically blocking and relying on your defenses for long, boring stretches, then run around and place crystals to imprison her. Rinse, repeat, etcetera no less than five times.
* The Crystalline Entity in ''VideoGame/StarTrekOnline.'' The famous Crystalline Entity from ''The Next Generation'' requires an entire fleet of ships to kill, and it requires that EVERYONE learn a very specific set of tactics. The Entity itself is not terribly powerful. It will directly attack whatever ship currently has the most aggro, but a cruiser who specifies in healing and aggro control can take care of it without any hassle. The entity sends out little shards from its body to chase after the ships. Also not a problem if you put enough power into your engines to outrun them. If you get hit by them, two things happen: You will instantly die or come dangerously close to dying, and the entity itself will heal a huge portion of its life. The entity has an insane amount of hitpoints, so instantly healing itself by 7% will just add another 10 minutes to the fight. There are certain crystals which players are allowed to kill, and others which will also heal the Entity if they are destroyed. Once it gets knocked below 30%, it switches up tactics a little, but is still not too difficult to handle as long as everyone knows what they're doing. All it takes is one player to completely mess up and ruin the entire fight for EVERYONE, resulting in the Entity healing itself back to full health in few seconds. The encounter itself has rarely ever been defeated save for fleets who specifically organize just to take it down. It became so much of a hassle that the developers eventually decided to just remove the encounter altogether. Now, nobody can fight it.
* In ''VideoGame/RuneScape'', during the BossRush at the end of [[WhamEpisode The World Wakes]], the last boss you fight is [[ClingyJealousGirl Enahkra]]. Enahkra has a ton of HP and can leech your HP to heal hers. And she does so ''constantly''. The more HP you have, the more she heals from her leeching attacks. Even worse, as the fight drags on, she eventually graduates to pinning you down and sucking your HP away until you can break her grab. The only way to really reduce the amount she heals by is to keep your health as low as possible - a risky proposition, considering she also has reasonably powerful magic attacks.
* Various bosses in ''VideoGame/MapleStory'' have skills called Weapon Cancel and Magic Cancel, in which your attacks (weapon or magic, depends on your job) all deal 1 damage for a short period of time, with a tiny chance of breaking through. Another form of this is Damage Reflect, in which you deal 1 damage and receive a certain amount of damage back, depending on the boss. In many cases, this is a 1hko.
* The second boss of the Hullbreaker Isle dungeon in ''VideoGame/FinalFantasyXIV'' doesn't hit particularly hard, doesn't have a lot of HP, and its special attacks are laughably easy to dodge. However, it spends half the goddamn fight underground, untargetable, from which it launches its irrelevant special attacks. The diving mechanic doesn't make the fight any harder, it just makes it a lot longer than it ever had to be because, for half of the fight, you can't damage it. You're stuck waiting with your thumb up your ass until it surfaces so you can wail on it for all of 15 seconds before it dives again.

[[folder:Platform Game]]
* ''VideoGame/DukeNukemManhattanProject'' has the BonusBoss Wozma. It's an immobile green sphere with about ten times the health of any other boss in the game and takes a good half-hour of repeatedly jumping up and firing off rockets at it before you finally do enough damage to kill it. What do you get for your trouble? [[CosmeticAward An icon on your saved game]]. That's it.
* Franchise/SonicTheHedgehog:
** The boss of Carnival Night Act 2 in ''[[VideoGame/Sonic3AndKnuckles Sonic 3 & Knuckles]]'' is this unless you exploit Sonic's insta-shield move. Before you can attack, you have to wait for him to circle after you, drop a big ball, charge up his tractor beam, outrun said beam, and then, finally, you can hit him once or twice while he retrieves the ball. Then the whole sequence repeats while your timer ticks ever closer to the deadly [[TimedMission 10 minute mark]] since you're at the end of [[MarathonLevel a very long level]].
** ''VideoGame/{{Sonic Rush|Series}}'''s bosses are often like this, taking their sweet time doing nothing but you can't hit them, or giving you very little room to hit them without being stupid hard. ''Sonic Rush Adventure'' completely averts this -- the bosses take millions of hits, but you can hit them often and they are usually quite short. Even the one that takes just four hits as you have to navigate an obstacle course. At least you're doing something.
** The second [[MirrorMatch Sonic vs. Shadow fight]] in ''VideoGame/SonicAdventure2'' is ridiculously easy to not die on, but ''actually doing damage'' can be difficult, as Sonic/Shadow is almost always capable of making himself immune to your attacks (and has excellent reflexes).[[note]]Until you notice that he leaves himself completely open to attack for a few seconds after using his special attack. Dodge it, then homing attack or spin-dash quickly to win![[/note]]
*** On the other hand, because of that, this boss makes great life grinding material due to the umpteen rings on the track.
** Metropolis Zone in ''VideoGame/SonicTheHedgehog2''. In a game where most bosses can be hit several times in a row (and some can be hit the required eight times before it's finished its first attack), it takes an age to beat. It's surrounded by seven flying canisters, which rotate around the boss, meaning you can't just strike at will like most other bosses without risking damage. Doesn't help that it darts along the floor both ways, so you have to jump over it (a full jump as Sonic and Tails, hope and pray your jump is timed so the balls are lower as Knuckles, or you will get hit). It then centers itself, expels the canisters round itself, before pulling them back in horizontally, which is when you attack. After a successful hit, it releases a canister, it opening to reveal a balloon Eggman. Bursting this gets it to start all over. Once you're rid of all the canisters, it tries to fire a laser at you, which is very quickly destroyed in comparison of all the waiting for an opening you would've just endured on the previous seven hits. This was made so much easier in Sonic & Knuckles, where a change in jump physics meant you could get all the hits in after Metal Sonic had gone through that pattern once, unless you were dumb enough to grab the fire shield, which would mean you'd have to do it the long way.
** Sonic's fight with Iblis in [[VideoGame/SonicTheHedgehog2006 Sonic the Hedgehog (2006)]] just might be the king of this in Sonic games, if only because of how boring and drawn out it is. Unless you have the Purple Gem (which at this point in the story, you won't) you'll spend about a minute and a half between each attack just standing there waiting for Iblis to expose himself. God help you if you miss an opportunity to attack him. By the way, Shadow has to fight this boss too, and he never gets a purple gem to abuse.
*** Also, Silver's boss fight from the same game. Whenever you get close to him while he isn't jumping, he grabs you telekinetically and throws you into the wall. Not only can he get you in infinite teleport lock if you're up against the wall and keeping collecting the rings you drop, but due to the game's glitchy nature he can ''throw you out of bounds''. At best this means you can explore a completely empty version of the hub while Silver is trapped within the bounds of the area you're meant to be in. At worst it means you ''don't hit anything and fly through space infinitely''.
** Egg Emperor in ''VideoGame/SonicHeroes'' is just plain obnoxious. He spends most of his time [[GetBackHereBoss backing away from you]] just fast enough to be hard to hit, and it has HP in the hundreds, when the most damage you can do in one hit is around four. Of course, to do that much damage, you'll have to find "power cores" that are hidden in various parts of the arena, most of which are risky to try to get to for one reason or another. His attacks are easily dodged, but just disruptive enough to get in your way when you're trying to attack ''him''. He isn't even particularly ''difficult'' -- he just takes so long to beat that you're practically guaranteed to slip up eventually.
** The Time Eater from ''VideoGame/SonicGenerations''. Not only is it the glitchiest part of the game, the other characters never shut up.
* All four of the bosses in ''VideoGame/SonicSpinball'' are Goddamned ones to an extent. While their arenas aren't particularly deadly and the bosses themselves can't kill you, all of them can knock you ''out of their arena and back to the level'' (though fortunately they don't heal when they do this), and they all take quite a few hits to kill, which can take forever without some practice. Oh, and most of them can summon flunkies.
* ''VideoGame/MegaManClassic'':
** From ''VideoGame/MegaMan1'', Fire Man. It's not that he's terribly difficult to beat, but that it's nearly impossible to avoid getting hit a few times in the process, unlike the other Robot Masters. The reason for this is his inconsistent firing pattern which makes it very challenging to time jumps to avoid them, and in some cases makes it quite literally impossible to avoid. He also creates small flames near or even underneath where you're standing or jumping, which can force you to land in a spot where you won't be able to dodge an oncoming shot. Even with hitting him with his weakness, the player is likely to suffer a couple of hits -- not so bad when he's the last boss of a stage, but can be absolutely ''infuriating'' during the end-game BossRush, the only one in the whole series that gives you NO health bonuses after defeating the bosses and forces you to start from the first boss all over if you die during any of them. Of course, if you know a rather cheap strategy of how to beat him, he'll be much easier.
** Bright Man from ''VideoGame/MegaMan4'' also counts, as he has an ability to stop time and then body slam you while vulnerable. It hurts a ''lot''. Bright Man is the bane of anyone trying a no damage run.
** Big Pets, the first Wily boss from ''VideoGame/MegaMan5'', which if you don't want to waste weapon energy for the Crystal Eye, can often involve switching weapons mid-pattern. It also doesn't help that the pattern to beating it gives you a small window to hit its weak spot, during which it's entirely likely one of its attacks will intercept yours, forcing you to do the entire thing over.
* ''VideoGame/MegaManX'':
** Wheel Gator, Magna Centipede, Bubble Crab, Serges, and to a lesser extent Crystal Snail from VideoGame/MegaManX2. They follow a common trait in that they they tend to be hiding for the most of the battle, whether it's under sludge, seemingly nowhere, in a bubble, behind a barrier, or in a shell. In the SNES version (as compared to the X Collection verison), Serges' main attack also lags the game, which doesn't do much but slow things down and make it take longer. Wheel Gator is probably the worst, though, since using his weakness against him causes him to dive immediately if you don't know how to chain him properly. None of them are excessively difficult, but they fights can feel like they're dragging on.
* ''VideoGame/MegaManLegends'' has two bosses, one right after another (which can be fought in either order) in the second and third sub-cities. Pity the fool who completes the first (and very easy) sub-city and challenges the next one [[DifficultySpike without bothering to save and heal]]:
** Guynie Toren of sub-city 2, a massive and heavily armored train-like reaverbot. He can only be damaged when he opens his hatch to [[MookMaker unleash Hokkoro and Sharukurusu]], leaving a small window to damage him, ''and'' he's also a DamageSponge. The problem here is he gives you little to no reaction time before opening his hatch again, and you'll be too busy dealing with the Sharukurusus, which are among the [[DemonicSpiders deadliest enemies in the game]] (the tactic with dealing with them in ruins is typically to stay out of their reach and run like a little baby). The only thing stopping Guynie Toren from becoming ThatOneBoss is most savvy players will eventually figure out the tactic[[note]]Let him flood one half of the huge battle arena with enemies until he's not releasing anymore. Then let him head to the other end and destroy one from a distance. He'll only release one at a time now which can easily be dispatched between attacks on him[[/note]] which makes him much easier.
** Bruno who guards the entrance to sub-city 3. Another DamageSponge who has a very small hitbox (his abdomen), spams the annoying [[ThatOneAttack shield-breaking-homing-orb]], and can destroy the buildings you use as cover or to stand on to hit his weak spot easier. You can only land hits on his weak spot with a tricky jumping shot, making the fight just drag on and on while your health slowly drains from his attack spam, and more often than not when dodging an attack you'll get blocked by a building or debris and get hit. Tron refers to Bruno as her masterpiece and destroying it [[VillainRespect makes Tiesel admit defeat and praise Mega Man]], and with very good reason: it does ''not'' go down without a hell of a fight.
* ''[[VideoGame/MegaManLegends Mega Man Legends 2]]'s'' train boss. Good God, ''the train boss''. It's actually a very easy fight with very easy to dodge repetitive attacks, but the train has [[DamageSpongeBoss so much health]] that the fight will easily take more than an hour to complete. The last portion of the battle, where you're trying to shoot out the engine, is quite literally twenty straight minutes of standing there not moving (except to ''occasionally'' dodge an attack) and just holding the fire button down.
* ''VideoGame/SuperMarioGalaxy'':
** Kingfin isn't difficult, he's just ''insanely'' annoying. After you get the first hit on him, he'll surround himself with several torpedo fish which have a nagging tendency to [[TakingTheBullet get in the way of your attacks]] against Kingfin, no matter how perfectly you've lined up your shot. The fight essentially just devolves into a pattern of find a shell, swim around a while looking for Kingfin, find him, line up your shot, watch it hit one of the torpedo fish instead of Kingfin, curse your bad luck, and then start the pattern all over again. This fight can take a while.
** Also Bouldergeist in a standard playthrough (on the Daredevil run, he's an outright ThatOneBoss). On this difficulty, the fight consists almost entirely of running around and grabbing rocks to hit him with. It's pretty easy, it just takes a little while.
* ''VideoGame/SuperMario3DWorld'' has the Hisstocrat battle. Not the first one in World 3, with just Hisstocrat himself, or the second in World 8, with his queen. The third battle (found in [[spoiler:the third bonus world]]) has [[DualBoss both King and Queen Hisstocrat fighting you simultaneously]], which means the battle takes twice as long and you have twice as many things to keep track of. And you don't have time to be patient with the battle, because the stage in which this boss appears is a boss rush, where you have to fight six of the game's bosses with no breaks, and you have only 500 seconds to defeat all of them. Most of the others can be defeated relatively quickly, but the Hisstocrats take forever to bring down, and if you take too long on them, you're likely to run out of time later in the level.
* The Koopa Clown Car in ''VideoGame/IWannaBeTheGuy''. It has three forms. The first two are really easy, but involve sitting through around two minutes worth of animations every single time. And you'll be doing this a lot of times, because the third form really is hard. If you die in the room right after the boss fight, you have to do the entire boss battle over again. Hell, even if you ''do'' remember to go back, the entrance to the previous room isn't level with the ground, so you'll try to go back and find that you apparently can't.
* The battle with Mr. Patch in ''[[VideoGame/BanjoKazooie Banjo-Tooie]]'', in which the player has to aim at randomly appearing weak spots while struggling with clunky flying controls and trying not to get clobbered by [[ItMakesSenseInContext exploding beach balls]].
* Trouble Bruin in the tower level of ''VideoGame/DynamiteHeaddy''. You climb a tower with little platforms on it, forced-scrolling up. He uses a tool to remove sections from it, so you have to keep moving up. Keeping pace is very easy. Sometimes he will [[TacticalSuicideBoss decide to move in]] (the only way you can get hurt besides falling, which is not instant death in this game), and that's when you can hurt him. It's [[LuckBasedMission random]] whether he moves in or just keeps taking chunks out of the tower, and you can be there for quite a while. Most players good enough to get here could last all day, but it's still easy to get yourself killed out of impatience. The game even gives you a secret bonus point for taking a long time on this boss, as if to say "here's a consolation since the [[RandomNumberGod RNG]] is being so damn mean to you". This, combined with the game's [[DifficultySpike split difficulty]], hurts the game's {{Speedrun}} appeal significantly.
* ''VideoGame/SuperPaperMario'':
** King Croacus is guarded most of the time by his armor, has spinning flower petal blades the size of Bowser cycling (albeit rather slowly) through the arena, and is somewhat difficult to hit. He's not hard, he has relatively low HP, and is easier once you figure out that you can grab the giant spinning blades and throw them at him (which is a little unintuitive, since that's the sort of thing you tend to ''avoid'' in games).
** Mimi is relatively easy to defeat, the problem is that to beat her, you have to hit her with the jewels she throws at you, knocking her partially off the ceiling, and unfortunately, it's pretty easy to misjudge the jump to GoombaStomp her, and end up crashing into her, hurting you instead.
* [[RecurringBoss Lord Vorselon]] in ''VideoGame/RatchetAndClankFutureACrackInTime''. His attacks aren't particularly hard to avoid, but they are annoying (mostly being variants of BeamSpam), [[BossBanter he loves to hear himself talk]], he can be quite a DamageSpongeBoss depending on difficulty (made worse in the first fight with him by your limited weaponry), and he has this nasty habit of turning invisible, during which time he is invulnerable, but can still attack ''you''. Oh, and sometimes he reappears [[CameraScrew off-camera]]. The fight with him can degenerate into "Vorselon appears, attacks you while you chip a small sliver off his health bar, then disappears" ad nauseum.
** The final battle against the [[RecurringBoss Thugs-4-Less leader]] in ''VideoGame/RatchetAndClankGoingCommando'' is a very long tedious fight where you have to shoot at his [[HumongousMecha giant robot]] via some automated turrets on the roof of buildings. for a lot of time you're up in a turret the boss is throwing homing missiles at you which you constantly have to shoot out of the sky to avoid taking heavy damage. These missiles tend to alternate sides, so rather than constantly firing at the boss, you're constantly shooting out the missiles, hoping that in your movement a few shots hit the boss. After a few rounds of missiles the boss will decide to come over to smash the turret with a very telegraphed attack that's easy to dodge. This of course means you have to find another turret to keep doing damage. So long as you keep moving, and can hit the homing missiles you should never take damage, but the high health of this boss means it can take at least ten minutes to do this [[note]]if you manage to chip the very last points of his HP off with a normal weapon that needs levelling up, that weapon will gain a LOT of Exp for the "kill"; very good for a one-shot Exp boost on otherwise-difficult weapons[[/note]].
*** This is made worse by the fact that if you attempt to use a regular weapon on the boss, the game will lock onto the space ''between his feet''. And no, even though there's a target there, it won't register as a hit. So if you want to throw some Mini-Nuke or RYNO II shots at him to chip off health and break the monotony, you've got to actively fight with the mechanics to get your shots to even connect.
* The Khrome Keeper in ''VideoGame/PacManWorld'' is very little of a threat, as all he can do is kick crates at you. The biggest, most annoying threat of the fight? The magnets. To damage the Krome Keeper, you have to hit some switches that are superheated, requiring you to use the [[ChromeChampion Chrome]] [[InvincibilityPowerup Ball]] that drops from the crates he kicks to avoid being damaged. This, however, makes you affected by the electromagnets that move around above said switches. Run under one and it'll pick you up, leaving you helpless until Chrome Pac-Man mode wears off or (more likely) drops you in a damaging acid pool, which you can't escape while in Chrome Pac-Man mode and can only escape once it wears off (and you better quickly get out while your temporary invincibility lasts). Now add on the fact that this is all timed, and the switches are randomized and all around the place...
* Master Kaag, the ''first'' boss in ''VideoGame/Rayman3HoodlumHavoc'' has only one attack, which is crushing you, but it's a very debilitating one that takes you several seconds to recover from. To damage him, you have to press the buttons on the field 3 times to summon the Shock Rocket powerup then shoot him with it 3 times, but once the powerup is on the field he can simply walk over to it and stomp the center to cancel it out, forcing you to start the process over again. Even if you get the powerup, he can still crush you and it will wear off rendering your efforts fruitless, or the powerup can wear off while the Shock Rocket is in mid-flight. Adding insult to injury, he's a BrokenRecord that spams the same line ad nauseum.
* ''VideoGame/AlisiaDragoon'''s Stage 7 boss: a DamageSponge of a MarathonBoss with a very repetitive attack pattern and short vulnerability window.
* Kroctopus in the Game Boy Advance version of ''[[VideoGame/DonkeyKongCountry3DixieKongsDoubleTrouble Donkey Kong Country 3]]''. It takes 9 hits to defeat (which is a lot for this series, excepting ''[[VideoGame/DonkeyKongCountryTropicalFreeze Tropical Freeze]]''), and dodging its attacks usually consists of either waiting on the platform for it to repeatedly extend and retract its tentacles slowly in a different direction or reacting quickly and jumping out of the way as it actually aims them at you, without much in between. It probably doesn't help that it's significantly easier to fight with Dixie and her [[GameBreaker helicopter spin]] than Kiddy.
* Pyribbit in ''VideoGame/KirbyTripleDeluxe''. While he can be rather dangerous at first, it becomes clear that a lot of his attacks are very telegraphed and follow a clear pattern. But no matter how good you get at the fight, there's nothing that can stop from jumping into the background, and absolutely every opportunity to attack him when he comes down is incredibly short. Can be extra frustrating in [[spoiler:Dedede Tour]] where you not only have to deal with the harder (DX) form, but you're trying to be quick about it, as well! This actually applies to most bosses in ''Triple Deluxe'', since this game introduced the mechanic of 3D background layers and every single boss (even minibosses) uses it to some extent, dragging the fights out. That said, none of the others are anywhere near as bad about it as Pyribbit.
** Speaking of Kirby, ''[[VideoGame/KirbyPlanetRobobot Robobot's]]'' Holo Defense API on its last hit: It zips around the room and does not even attack, but it is so difficult to hit that it can take more time to land that hit than the entire first phase of the boss.
* ''Every'' boss in ''VideoGame/RaymanOrigins'' qualifies due to basically being a memory test. They follow the exact same scripted attack pattern every single time, but give little to no warning or time to react with each of their attacks. Every single boss fight goes "Get hit with attack one and die. Dodge attack one, get hit by attack two. Dodge attack one and two, get hit by attack three. Lather, rinse, repeat." The battles are quite easy: the game isn't challenging you to be good at it so much as it's challenging you to either be clairvoyant, have good memory, or be [[GuideDangIt following a walkthrough]].

[[folder:Real Time Strategy]]
* ''VideoGame/DawnOfWar II'':
** The game gives us the Avatar of Khaine, and the warboss, to an arguably lesser degree, both of them near-endgame bonus bosses with what feels like more HP than all other bosses in the game combined, a considerable repertoire of near instant kill attacks and 'spells,' as well as the ability to call in the most powerful units of their respective races as reinforcements. The only way to defeat these monstrosities tends to be a good twenty minutes of hit and run attacks with your ranged squads, and if you should lose focus only once, there is a good chance they will be swathed with a well placed area of effect spell, forcing you to repeat the entire process. Oh, and they do of course regenerate HP at a disturbing rate.
** The second sequel, Retribution, gave us a more straight example in Mad Meks, who you fight in the first Ork mission on the Space Hulk. He's armed with a [[FunetikAksent Rokkit Launcher]] that will blow the crap out of vehicles but do pretty piss poor damage against heavily armored heroes, doubtlessly not enough to ever overwhelm the healing you can do with liberal applications of the items/abilities you have at your disposal. However, his armor has a chance to teleport anyone who melees a reasonable distance away from him. Thus, the majority of the fight will be spent telling your own units to run up and hit him in the face over and over again without ever being in any real danger of losing. The fact that he can immobilize everyone temporarily or take damage to his energy bar rather than his health doesn't help either...
* In the Protoss mini-campaign of ''VideoGame/StarcraftII'', the player fights Maar, a [[HybridMonster protoss-zerg hybrid]] and an extremely annoying boss. Every time he is brought down to zero health, he returns to his spawn point and regenerates before coming back for another round. To make matters worse, Maar keeps doing this until the end of the mission, and comes back stronger ever single time. What stops him from being ThatOneBoss is the fact that he's not all that tough; because of his massive energy capacity, a single high templar can take out half his health with its disruption ability.
* Paladin Uther in the Undead campaign of ''VideoGame/WarcraftIII''. You only have basic infantry to deal with him, whom Uther can one-shot with the same spell he can also heal his pose of knights with. Next, due to his trait, both he and the knights have ridiculously high armor. And finally, he can become invincible for 45 seconds, with no option for you but to wait it out. You can always run away and spawn more units, so '''eventually''' he will go down, but it's still a very long and tedious fight. Thank Nerzul, at least he cannot ressurect his knights if you kill them, or else keyboards would be broken.
** Frozen Throne makes things even harder. The final Undead mission has Arthas who is brought down to lvl 2 while up against Illidan, and his Naga and Blood Elf army, and the three opposing heroes are at lvl 10. Thankfully, [[GeneralFailure Illidan's an idiot]] and you get the walking mass of murder that is Anub'Arak to babysit Arthas until he's back at level 10.
** Any high-level Blademaster is one by default, due to their "mirror image" ability. With any other enemy hero you at least know ''what'' to attack. This bastard can spawn three dopplegangers, who look exactly like him, down to the HP and mana count. Yes, there're ways to tell: the copies cannot actually harm you, they take extra damage from attacks and super-extra damage from banishing spells, - but good luck using those in the heat of battle, and once you single out the real one, he just recasts the spell, and the fun starts anew!

* ''VideoGame/{{Angband}}'':
** [[LordOfTheRings Smeagol]]. His attacks deal negligible damage, but he has a lot of health, moves quickly, and can steal your money whenever he hits you. Even worse, he teleports whenever he steals from you and you couldn't get your money back until a recent update. Also, he's invisible (though warm-blooded, so you can see him with infravision if you're the right race and he's near) at a point when you usually can't yet See Invisible. At least he usually drops great items when killed (not anymore -- over the last several versions, the chance that he'll drop a pittance of copper pieces has been steadily rising). It's a bit better if you have some manner of generating bright light, as he'll run away from it. Of course, this means you'll have to chase him around the level.
** Also, later bosses that can heal and teleport self. Can be close to impossible to kill if the "smart monsters" option is on -- normally monster casting is a 1-in-X chance (it can be 1-in-2 or even 1-in-1), but in smart mode they '''are''' able to choose (with a high probability) which spell to cast (for example, healing about 10 rounds worth of your damage).
* ''VideoGame/TheBindingOfIsaac'':
** Gurdy. Gurdy does not move. However, she has a TON of HP, rivaling all of the possible [[FinalBoss Final Bosses]]. She constantly spawns Flies and Boils, the former of which are rather mobile, and the latter takes a notable amount of time to defeat. Oh, and she fires five way shots. And this is her BASIC form. Oh, and unlike the other bosses, she NEVER shows up as a DegradedBoss. All but one of the other non-Final Bosses before Mom do. [[spoiler:OK, she actually DOES, in TheVeryDefinitelyFinalDungeon, The Chest. But you only fight ONE in a room. None of the other bosses are like that. Every other room in The Chest contains multiple bosses or chests.]]
** The ''Wrath of the Lamb'' expansion adds the Mask of Infamy, the aforementioned "one". There's two parts -- a heart, and a face, the latter of which charges at you. Until you kill the heart, the face is invincible, but even once you've done that, you can only hit the '''back''' of the face. If you don't have piercing shots, it's absolutely hellish, forcing you to weave in and around and get two shots at a time in if you're lucky. It's also the ONLY boss in the game that doesn't have a health bar, [[spoiler: save the substantially weaker and easier to deal with Famine, when facing him in the Chest alongside another Harbinger,]] meaning you don't even know how close to death the boss is!
*** On a similar note, the Carrion Queen is another of the three bosses you can only hit from the back (the last one being the much more tolerable Scolex). Specifically, she is a grub, armored everywhere save for her tail section. Her first form is bearable - she acts like Chub, charging towards you when she sees you - but the second phase of the fight is just painful: When damaged enough, The Carrion Queen begins to move ridiculously fast in diagonal patterns, bouncing off of walls and off the red poop it drops in its first phase, making her very unpredictable and difficult to hit without sufficient speed or shot speed. Unlike Mask of Infamy, though, the Carrion Queen has a health bar, and can spawn as an easier variant which never enters the diagonal phase and spawns miniature Hearts that you can kill to damage the boss itself, so for most players, it is the second-most annoying boss after the Mask of Infamy.
** Also from ''Wrath of the Lamb'' is Widow. This giant spider thing can randomly appear as the boss of the first or second floor, but is more akin to one of the later ones. Widow spawns white Boils, which in turn spawn ''loads'' of spiders, which dart around the arena and hurt you. Widow also has a very fast jump attack and spits white creep (web) to slow you down so that the spiders and Widow can all gang up on you. You also cannot hurt Widow while it's in the air. The one saving grace you have is the boils and spiders aren't immune to Widow's stomping, which keeps the crowd under control.

[[folder:Role Playing Game]]
* Tortigar in ''VideoGame/SkiesOfArcadia''. He only has two attacks, a normal attack and a hit-all attack, neither of which are particularly damaging. However, he has [[DamageSpongeBoss rather high health]], tends to spend every other turn [[ThatOneAttack making himself invincible]], and has the ability to ''[[HealingFactor fully heal all of his health]]'' and WILL do so at least once every time you fight him. The main strategies for beating him are either spamming Spirit moves and hoping he isn't invincible/healing himself on that turn, or saving up your Spirit bar to its maximum, using one of your LimitBreak techniques that make your enemy skip a turn, and hope he doesn't heal himself during the two or three turns you're recharging.
* Bosses in ''VideoGame/MarvelUltimateAlliance'' games aren't particularly hard in and of themselves. Unfortunately, these bosses do nothing but spam attacks that knock your heroes all around the room and interrupt your attacks. Plus, while they can knock you all over the place, they themselves are [[TheComputerIsACheatingBastard completely immune to Trip, Stun, Popup, and Grappling.]] This reaches head against wall levels when you find that a party full of [[MightyGlacier Mighty Glaciers]] and [[FlyingBrick Flying Bricks]] can be kicked around by minor villains whom they should realistically be able to one-shot. Basically, every boss fight slaps your entire team of superheroes with TheWorfEffect. This was slightly improved in the second game, which gave larger characters like the Thing and the Hulk "knockback resistance," so they could no longer be PunchedAcrosstheRoom.
** A particular example, the Mandarin, requires the player to guide an exploding spider robot into a very specific location to make the boss temporarily vulnerable. You're more likely to die from the spiders exploding before you get them to the spot than you are from anything the boss can throw at you.
* Lavos' Outer Shell, in ''VideoGame/ChronoTrigger''. It's a BossRush against... well, ''every boss in the game'' (skipping a handful of sub-bosses like the R-67s and Beast Keeper). But their stats have not changed in the slightest, so you'll be one-shotting a great deal of them, meaning about 90% of the battle is waiting for Lavos to announce its next form, killing it, and waiting for the game to catch up. (The other 10% are Black Tyranno and Giga Gaia, which are still kind of tricky.) Some of his forms will also ManaDrain you upon death. You have a breather to drink some Ethers (and probably have quite a few to drink), so it's not really dangerous so much as the giant space bug giving you a big ole middle finger for no real reason other than sheer spite. Fortunately, if you choose to [[RammingAlwaysWorks slam the Epoch into it, you skip this part.]]
** Special mention must be made of when Lavos imitates [[spoiler: Nizbel]], as he's an enemy whose defense has to be lowered via [[spoiler: lightning spells]]; otherwise, the party is lucky to be doing even double digits of damage, even with their most high-end attacks and spells. When you fight the actual boss during the game it's not a problem, as [[spoiler: Crono, who has lightning magic, is a permanent party member until his death/resurrection, which occurs after that fight]], but if you forget to bring [[spoiler: either him or Magus]] along to this part of Lavos's final boss rush, you're stuck either [[DeathOfAThousandCuts slowly whittling down his health]] for half an hour, or resetting the game (or dying).
** The Son of Sun may be this depending on your set-up. You can't attack it directly, instead you have to pick one of five targets that orbit the darned thing to damage it. Pick correctly and you inflict a set quantity of damage; pick wrong and it counter-attacks. It's completely [[LuckBasedMission Luck-Based]] which one is the right choice, and he shuffles them around regularly with no hope in hell of keeping your eye on the right choice. The intended solution is to have a fire-immune party member use a screen-filling attack to quickly figure out which one doesn't counter (and is therefore the target). Of course, if this is your first go at the fight or you don't have the equipment, it's going to take a while.
* ''VideoGame/ChronoCross'' has a Goddamned BossRush: the elemental robot-things in Terra Tower. They have quite a few hit points (and tend to spam healing elements at the worst times). They also love to spam status buffs and debuffs to turn the entire field to their elemental color, which sends the power of their elements through the roof. Combine this with ''Cross''' already severe EndingFatigue and you have a recipe for maximum annoyance.
* Many of the bosses in ''StarWars: VideoGame/TheForceUnleashed'' can be these if you're having an off day. They end with mandatory ActionCommand challenges, and if you keep screwing them up, you'll wish you could just give 'em a basic slash and call it a day. Same deal with ''{{Spiderman}}: Web of Shadows.'' The Gorog in the sequel to the Force Unleashed can be a MarathonBoss with repetetive mechanics.
* ''VideoGame/PaperMario'':
** [[RecurringBoss Jr. Troopa]]. He has higher defense than most enemies to begin with, and gains a new immunity with each battle. And this being a game where you only have three or four modes of attack, that's a big deal. Your only options are to spam certain partners' attacks - and the more effective ones tend to cost a ton of [[{{Mana}} Flower Points]] - or to come into the fights (which are all totally unannounced) specially equipped.
** Big Lantern Ghost. You fight it in a dark room, where you can't target any enemy unless you can see it; the only enemy you can see is its lantern, which you must hit at least twice so that you can attack the Ghost in the first place. Except that it blows out the lantern on a regular basis, forcing you to keep. doing. this. Making matters worse is that one of its attacks hits your partner (which forces you to miss their turn for multiple turns at a time) and is nigh-impossible to guard against with your ActionCommands except by pure dumb luck. And speaking of ActionCommands and pure dumb luck, the battle routinely lags if you're playing the UsefulNotes/VirtualConsole release of the game, making even basic timed hits obnoxiously difficult and the battle much harder than it needs to be.
* The bosses in the ''[[VideoGame/MarioAndLuigi Mario & Luigi]]'' series for Game Boy Advance and Nintendo DS are juuust beatable with normal attacks to qualify as this, instead of Puzzle Bosses. Most bosses had high HP, a weak point, regenerative abilities, and even flunkies. Sometimes a boss fight done wrong could take an hour, literally. Remember the rock monster slash tree thing outside the Toad village in Superstar Saga? Yeah, like that.
** ''Partners in Time'''s final boss marathon. The final boss alone has two phases, obscene health, heals every few turns, has a weak point that can only be attacked after destroying two other weak points, and they regenerate too, it attacks multiple times per turn and deals high damage: a true evening-filling final boss. These bosses are the reason the GameBreaker Ulti-Free Badge is worth getting: unlimited Bros. Attacks for one Bro is the only way to make relatively quick work of them.
** The Elite Trio in ''VideoGame/MarioAndLuigiDreamTeam''. Why? Because you have to take them all down in one attack, otherwise the ones left standing revive their fallen comrades. Or in other words, you pretty much have to win with either Luiginary Ball, Luiginary Wall or Luiginary Typhoon (or maybe a certain badge effect), since anything else won't hit a wide enough area to take down all three at once.
** Additionally, some of the Hooraws fought in Dreamy Wakeport before Big Massif are this, since they're not hard in the traditional sense or have particularly powerful attacks, they just have a battle 'rule' that makes it annoying. Like the one you have to defeat in three turns (along with all his minions are the same time), which is rather annoying since you don't have any more powerful Luiginary attacks than Luiginary Ball and Luiginary Stack.
* The boss of the official ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'' plug-in Siege at Firemoth (Grum) has 2000 hp with a regeneration effect while the final boss of the first expansion pack (a PhysicalGod) has 3000 HP and the second's (an aspect of a god) has 2000 HP at most and both have no regen. If you have decent resist shock effects he can't hurt you, but he takes forever to kill.
* ''VideoGame/Persona3'' has a few bosses that fall under this. In particular, most of the Full Moon bosses aren't particularly difficult ([[AntiFrustrationFeatures to make up for you not being able to save before then]]), but some have a few annoying moves.
** Chariot and Justice have that oh-so-annoying DualBoss staple: if they aren't both killed in the same turn, one will revive the other with full HP. This wouldn't be so bad if it weren't for [[ManualLeaderAIParty your party members being AI controlled]], so its hard to stop them accidentally triggering the revival.
** Strength and Fortune have the Wheel of Fortune mechanic, which can result in your party taking damage or suffering status effects if you can't work out how to stop it on the right spot.
** The Fanatic Tower, a Tartarus boss, isn't particularly threatening, but it has no weaknesses and is immune to all attacks except Strike and Wind. And even those two aren't fully effective: it's packing Dodge Strike to make your Strike attacks unreliable, and has Zio skills to hit your main Wind user's weakness.
* Shadow Mitsuo of ''VideoGame/{{Persona 4}}'' takes forever to kill, constantly giving himself a 1400 HP buffer that is pretty much impossible to stop. Beyond his [[AIRoulette AI randomly getting lucky]] and using both of his actions to attack the hero (instant game over if he dies) he poses no threat but is a war of attrition.
* ''VideoGame/RogueGalaxy'' has this boss battle around chapter 6: first you must get into a mine and fight a drilling-mining-robot-thing, which is painstakingly slow to defeat since you have to finish off each arm first. After that, he just keeps running around and hitting you with a drill that comes straight out of his...[[AssPull well, you get it]]. After a very LONG battle, you find out that it was not the end and you still have to fight [[ThatOneBoss the guy controlling it]]. With the newest member of your party alone (whom, of course you're barely accustomed to play). To make it even worse, said [[ThatOneBoss enemy]] can kill you in a few shots and moves way faster than you can, and the only real way to kill him is to keep blocking until he reloads, making the battle take a long time even when you know what you're supposed to do. Since blocking isn't that useful for most of the game, there are high chances you will lose; fortunately, there's the possibility to [[SaveScumming save your game before]] but, guess what? ''There is NO SAVING POINT between the previous battle and this one'' so if you happen to lose (which is most probable) you'll have to deal with the drilling-ass robot ''[[BigNo again]]''. Alluring, isn't it?
* ''[[VideoGame/KingdomHeartsChainOfMemories Kingdom Hearts Re: Chain of Memories]]'':
** The final boss of Reverse/Rebirth mode, Ansem, is like this. The entire fight basically consists of using card break duels, and he has maximum HP. Very tedious.
** The final boss of the main story mode in ''Chain of Memories'' also counts, thanks to having a set pattern of very easily-avoided attacks, and giving you plenty of time to heal if you do get hit, but only being vulnerable at one small time window during that pattern (and having the maximum amount of health possible in the game).
** Ruler of the Sky from ''358/2'' Days isn't particularly difficult. It's pattern is pretty basic, and it's attacks don't hit that hard. However it has a LOT of life and the entire battle is spent in the air where it will outrun you. This all adds up to a VERY long boss battle.
** Zip Slasher in particular is like this, but because of the inferior AI and battle system, lots of the enemies in this game qualify. Devastating attacks, but just falls to the same pattern spammed over and over again, but you have to keep doing it and if you mess up, you do it all over again.
** Ursula's first form is probably the first game's standout example. She constantly guards, is aided by her eels (who constantly declare [[MostAnnoyingSound "No escape!"]]), and can only be attacked by overflowing her cauldron with magic--but the game never explains exactly how that works.
* One of the BonusBoss in ''VideoGame/WildArms3'' is Arioch, [[BossSubtitles The Duke of Vengeance]]. True to the name, he's very easy to beat when you encounter him the first time, but afterward, he will, emphasis on ''will'', stalk you. Meaning that every random encounter will have a chance of you encountering Arioch. The mechanics is that Arioch starts as a level 1 boss. His level goes up every time an encounter happens. So, assuming the player's level is constant and is around lvl 70 when he/she triggers Arioch, about first 30-40 encounters will be cakewalk, the rest to 70th medium, and in the last 10 encounters: painful.
* Beldr in ''VideoGame/DevilSurvivor'', particularly on a NewGamePlus. Even if you have level 99 demons armed with Megidolaon and Deathbound, you, the main character, ''still'' have to [[spoiler:beat [[NighInvulnerable him]] to death with Devil's Fuge]], which means the battle still takes many turns. Damn you Myth/NorseMythology! While he can be quickly killed with the proper demons alongside you, his properties means you can't just one-shot him like every other early-game boss.
* ''VideoGame/DevilSurvivor2'':
** Megrez, the fourth day boss of the Septentrione Arc. It is a TimedMission, as three separate parties are fighting three Megrez pieces, but there is more than enough time to fight your piece of Megrez. Problem with this boss is, he is a scene-mandated boss, which makes this a very frustratingly stupid battle in NewGamePlus. Even if the party is strong enough to defeat Megrez during one skirmish, Megrez will still retain the gameplay-mandated scenes of moving to another section of the map, heal itself half-way and needs to be fought again. And it needs to be defeated a total of ''four times'' for it to properly stick. No breezing through this battle.
** Mizar in the Septentrione Arc is this, solely because of the premise of the battle. Mizar is about to be swallowed by the Dragon Stream, but clings with its two arms to the side of a building and the party needs to smack the arms enough, so Mizar will let go. Ignoring the factor of hitting Mizar's arms resulting in its arm spitting up two copies each time, Mizar keeps gripping onto the building and each arm needs to be defeated three times, before it will finally go down. Oh, and this is a TimedMission, too.
** Benetnasch from the same Arc as Mizar. Benetnasch has an ability called 'Pacify Human', which means that any human party member cannot damage him, so all damage comes from the summoned demons. That is, whether fortunately or unfortunately, his most annoying ability. The problem comes from bringing Benetnasch down to red HP, at which point the second phase of the battle begins and it has split itself into four, each modeled after one of the previous Septentriones the party has already defeated days before, all with their own weaknesses. The battle isn't necessarily difficult, but is unnecessarily dragged out by this. Made even more annoying by the fact that during the battle you have to [[EscortMission protect the Trumpeter]] from the Megrez buds' thunder skills (Trumpeter is unaffected by their earthquake field attacks) and cannot swap your demons.
** Spica in ''[[UpdatedRerelease Record Breaker]]'' has an AdaptiveAbility, and becomes immune to any element used to destroy one of its pieces. As you will almost certainly find out during NewGamePlus, this includes [[InfinityPlusOneElement Almighty]].
** In the Triangulum Arc, the battle against Arcturus. Smilar to the Beldr battle in the [[VideoGame/DevilSurvivor previous game]], Arcuturus can only be damaged through the normal attack of one character. Said character's attack does such pitiful damage, though, and several rounds go by, until another character arrives and assists. Arcuturus also has the ability to make everyone in your party weak to four Elements, but that can be countered by the protagonist using 'Soul Bind', to take the other party members' damage onto him. And the protagonist may not die during that battle, so keeping him safe is also a priority.
* Shot Mothers in ''VideoGame/PhantasyStarZero''. They appear randomly every 10 floors in a bonus dungeon with 101 floors, and you cant leave to tower for more items. She isn't strong by any means, but her annoying attack pattern of gliding across the room coupled with the lack of items makes her a very annoying fight.
* ''VideoGame/JadeEmpire'' gives you [[TheDragon Death's Hand]]. Despite being implied to be the BigBad for a good half of the game, the fight against him consists almost entirely of hammering him with repeated blows, then dodging his massive but cripplingly slow attacks. He was immune to stun and most status effects, so all you could really do was wait for his HP (or your sanity) to run out.
* ''VideoGame/FinalFantasyVI'':
** Tunnel Armor, an early-game boss. You fight it with [[LoveableRogue Locke]] and [[MagicKnight Celes]] in your party, but the fight requires you to constantly use Celes' [[PowerNullifier Runic]] ability, to stop the boss' devastating magic attacks. If Celes skips a turn of Runic to attack, then the boss' magical abilities can easily knock them both down. This leaves it up to Locke to slowly chip down the thing's HP, stopping periodically to throw Tonics at Celes and chug some himself. Becomes much easier if you use a [[DualWielding Genji Glove]] to double Locke's offense, but getting one that early requires a bit of a GuideDangIt. Additionally, if you [[GuideDangIt left a certain chest unopened in your first run through the area and opened it when you're going through at this point,]] it will contain a Thunder Rod, which you can use as an item on the Tunnel Armor to use Thundara, which ends up killing it instantly.
** Doom/Death Gaze. Let's see, he tries to pull a TotalPartyKill a la Level 5 Doom Spell the moment the battle begins, occasionally cuts off shit-tons of health with Aero or Blizzaraga, can randomly cast Level 1 Doom Spell to kill one of your party members, and hightails it after less than 5 turns. Oh, and he can appear the moment you take flight in [[spoiler:Daryl's]] airship, where he's likely twice your level and can kick your ass faster than you can say "what the hell was that thing?!". Oh, and when you ''do'' plan on fighting him and he flees, it can take ''forever'' to find him again. And don't think he'll just decide to stick around the second time around. Or the third. Or the fourth.
* "Bizarro Sephiroth" from ''VideoGame/FinalFantasyVII'' is fought in a unique multi-party battle and will constantly heal himself unless you figure out how to stop it, which requires using the secondary parties. It's easy enough if you know what you're doing, but if you don't you could end up there all day. And just setting up for the battle is a nuisance as you suddenly need to spread your equipment round all 6-8 characters not just three. Alternatively if you have LastDiscMagic such as Knights of the Round, Omnislash, or even 2xCut and W-Magic, you could just hit it faster than it can heal.
* From ''VideoGame/FinalFantasyVII'', [[FinalBoss Safer Sephiroth]], if you are leveled up thoroughly from sidequesting and have access to high-end Materia and weapons, is not a particularly hard boss. But in the North American version, Supernova has a hideously long attack animation that takes over ''two minutes'' to complete and cannot be skipped.
* ''VideoGame/FinalFantasyVIII'':
** The FinalBoss, Ultimecia. Granted, this is suppose to be the last battle you EVER fight, but consider the setup for all this frustration. It starts as a straight fight, you VS the sorceress. After that, however, she summons a GiantSpaceFleaFromNowhere that was apparently [[spoiler: living in one of Squall's personal items and innocently referenced during the Garden civil war]] to give you the beating of a lifetime. After you kill the creature, Ultimecia decides to merge with that Guardian Force (although they should both be too weak for combat at this point for having their asses handed to them) to create a hybrid creature. Finally, having defeated THAT, Ultimecia is back AGAIN, because getting thrashed and exploding wasn't enough, so now there's a faceless sorceress with even more power than ever for no apparent reason. This may be the last part of the last boss, but consider what you had to go through to get here and how long you had to go through the same battle cycles because the boss has WAY too many hit points and forms. Couple this against the game's system where you can't get a level advantage on any boss EVER and presto!
** This same game also has Jumbo Cactuar and the Tonberry King. The first one is a veritable damage sponge that takes an hour to bring into low HP, and after that, it fucking escapes if you do not give him a very powerful finishing blow. If the bastard escapes, you have to start over. The Tonberry King by himself isn't very annoying, but you have to fight twenty normal Tonberries to initiate a fight with him. Tonberries are powerful and high-HP enemies, so twenty battles with them are pretty much guaranteed to be repetitively unleashing your most powerful [=GFs=] and Limit Breaks on them. Sitting and watching the animation. MANY.TIMES.OVER.
*** With these two the player is actually ''punished'' for leveling up. Both bosses gain huge quantities of hitpoints for every extra level of the player party, far outstripping the increase in your damage-dealing potential.
* ''VideoGame/FinalFantasyX'':
** A large number of bosses in this game can fit this trope simply due to the large amount of unskippable dialogue in this game. FFX is very story-driven, but no allowances are made for retries. No cutscenes can be skipped, EVER. The impact of this can range from minimal to "go get yourself a sandwich and watch an episode of The Sopranos until you can fight [[spoiler: Yunalesca]] again".
** One of the last bosses , [[spoiler:Jecht]], will, at the appropriate level, take ages due to the very long healing animation of the two columns supporting the boss throughout the fight. The heals are not that big, but the columns can't be taken out of commission permanently, respawning three rounds later with double health if they are killed, and there is no way to speed up the animation. This can be somewhat alleviated by casting Zombie-status on him, since he's not immune and will thus take damage from the heals. The slightly annoying thing is that the heal does take off the status effect, but still damages him before it's cleared, so it's not so bad.
** [[spoiler: Yunalesca]] is often considered ThatOneBoss because of her multiple forms and her confusing Hellbiter-Megadeath combo, which gives you the Zombie status effect and then eventually [[OneHitKill insta-kills]] you if you remove it. If you do figure out her relatively simple attack pattern, however, she is simply ''frustrating.'' The Zombie status effect means characters are damaged by both regular attacks ''and'' healing, so there's no way to cure damage, and since she often casts Regen or Full Life, many of your characters will spend the majority of the battle dead or slowly dying. Sometimes it's better if a character does die so that all status effects go away when you revive them. Basically, you have to have a pattern where you switch out party members such that at you have at least one Zombie (or Deathproof) member when she casts Megadeath, and can revive the others before she kills them again.
** What makes her a true Goddamned boss is that she has more than 10 minutes of cutscene crap. It is actually quite good the first time you see it (as most cutscenes in this game are), but you will hate it more every time she kills you and you can't skip it.
* ''VideoGame/FinalFantasyXIII'':
** The Warmech you fight at the beginning of Chapter 12. At first, it's an easy fight, but if you take too long to kill it, it'll put up an unbreakable force field. Getting rid of the force field requires you to stagger it, which can take up to fifteen minutes. Unless one knows a [[GuideDangIt fast]] way to kill it.
** The second fight with the ''Proudclad''. It's a boss with 3.5 million HP, it's immune to all status ailments, and it can reset its stagger meter by changing form, which it can do whenever it feels like. And, once you get it down to about one million HP, it ''heals to full'', gets perma-Brave, Faith, and Vigilance, and breaks out some new attacks (thankfully, it Deshells and Deprotects itself as well). It's not powerful enough to really be a threat if you keep up with your healing, but it takes so long to fight that it's just a massive pain.
** Pretty much any of the Eidolon battles. Theoretically they shouldn't be too difficult because you win just by using certain abilities until a gauge is filled (like using Sentinel abilities during the fight with the Shiva sisters), but you only have one or two party members who are inflicted with Doom, giving you a time limit, and while the Eidolons aren't defeated like normal bosses ''you'' can still be killed. This is especially a problem when [[SquishyWizard Hope]] faces off solo against the Eidolon Alexander.
** The final form of the final boss, [[spoiler:Orphan]]. It's immune to all forms of attack until it's staggered, and it inflicts Doom on your party leader, leaving you with seven minutes to cut down its 3.3 million HP. It would be reasonable, except that it can use Temporal Hollow to reset the chain gauge pretty much whenever it feels like it.
** The BonusBoss Vercingetorix, and by extension the ''VideoGame/FinalFantasyXIII2'' version, Yomi. If you come prepared with high levels and know the trick to beating them, then they aren't too hard. However, they spend the first half or so of the fight repeatedly using Impenetrable Aura, which renders them invulnerable to all damage, removes all status ailments and debuffs, and heals them. Meanwhile, all you can do is heal and prepare to reapply Poison as soon as they pop out again. After they lose about half of their HP, they [[TurnsRed get angry]] and start using their more powerful attacks. Since Yomi only has 1.2 million HP, you can rush his HP down once he stops using Impenetrable Aura, but Vercingetorix has ''15.8 million HP'', so all you can do is keep tanking and wait for Poison to wear him down.
* ''VideoGame/FinalFantasyXIII2'' also has the Paradox Scope fights with Caius, all of which are time-consuming and easy to mess up. In the Oerba 200 AF fight, he has almost half a million HP, and casts Regen on himself halfway through that HP. If you don't know the trick to nullify Regen, you can end up not being able to outdamage the regeneration. In The Void Beyond, you have to fight him with only Serah and your monster ally, meaning all it takes is one slip-up to end the fight. In A Dying World, you fight him with ''only Noel'', which complicates things further. And in all of them, once he goes down, ''he gets back up'' and you have to fight him again.
* The third Weigraf fight in ''VideoGame/FinalFantasyTactics'' is often viewed as ThatOneBoss. At least until you learn the secret to beating him, at which point the fight becomes absurdly trivial. The fight is a one on one fight between Ramza and Weigraf, and the trick is to obtain the self-healing reaction ability (which isn't that hard, and is a pretty strong ability anyway, so the player may already have it) and give Ramza a job with high speed, and then spam Ramza's stat boosting abilities so that you can instantly crush Weigraf, and the even nastier Velius battle that follows (these are treated as the same battle, so the stat boosts carry over and it's often possible to kill Velius before it even moves). However, this can take a long time, as you spend time running away from Weigraf while constantly using your stat boosting abilities. The Weigraf / Velius fight thus ends up being ThatOneBoss or a Goddamned Boss, depending on how you tackle it.
* ''VideoGame/MassEffect2'' has the Thresher Maw. It only has one attack- firing blasts of acid at you, and there are no other enemies to fight, but the battle can be very frustrating because A) it has a ton of health, B) the Thresher can destroy some of the cover around you and frequently shifts position on the battlefield forcing you to constantly be on the move, C) it uses its acid blast attack frequently and said attack rips through your shields like a knife through butter, and D) you're on a 5 minute time limit the whole fight. However, despite the fact that running out of time doesn't cause you to lose, if you don't beat the Thresher by then you won't get the best reward, not to mention that destroying it is an in-universe ''and'' out-of-universe CrowningMomentOfAwesome.
* ''VideoGame/LiveALive'' has Voice Heart. The boss is overall not all that difficult, but has an annoying attack called Sweet Whisper, which a [[ThatOneBoss previous]] boss had, and send the character to sleep. Aside from that attack, though, it's a pretty standard [[AttackAttackAttack hit-it-a-lot]] boss, but becomes obnoxious, as he has to be fought ''repeatedly'' in the dungeon it appears in.
* Cornix Canor in VideoGame/TheWorldEndsWithYou. A [[GetBackHereBoss Get Back Here]] FlunkyBoss who picks up battlefield obstacles, screwing with your psychokinesis (and sometimes your shockwave, depending on the angle). Its flunkies are seemingly only there to give Neku something to do, while blocking Shiki's attempts to actually hit the boss itself. It's rather fitting that this boss is the one chosen to, in-universe, waste Neku's time.
* Every boss from the ''VideoGame/GoldenSun'' games with some kind of Djinn screw either counts as ThatOneBoss or this. Notable are the bosses capable of using Crucible, which unleash a Summon using ''your own standby Djinni'', meaning you lose both the Djinn stat boost, the chance to use that summon AND take a ton of damage. Fortunately the most glaring example (BonusBoss Dullahan) has a fixed pattern with its attacks, so much that with some planning he will use a level 1 Summon and deal almost no damage.
* [[BigBad Hargon from]] ''VideoGame/DragonQuestII'' likes to use Healall, which predictably makes the fight rather annoying.
* Shogum, a BonusBoss from ''VideoGame/{{Dragon Quest IX}}'', does on occasion summon King Cureslimes, which if you don't kill them quickly, will cast Omniheal, restoring ''all'' HP to Shogum (and the King Cureslime).
* ''VideoGame/ShinMegamiTenseiIIINocturne'' has Mara. He'll use Diarahan EVERY SINGLE TURN unless you can kill him before he uses it. That means you have to burn through his 2300 HP in one turn. Hope you have [[GameBreaker Bright Might]] or can [[ManaDrain steal Mara's MP because]] unlike most games, bosses in this game don't [[TheComputerIsACheatingBastard have infinite MP]]!
** If you prepare for the fight, Noah becomes this. He's a BarrierChangeBoss that changes what element will affect him every turn (Not his weakness, ''which element doesn't get nullified''), followed by a high damage elemental attack (One enemy at a time for the first phase, full party spells during the second phase). And you can't get around this by using [[NonElemental Almighty]] spells, as he's one of two bosses in the game that resists it. If you have all the elemental spells, the battle merely becomes a test of endurance and how much MP you can conserve. If you don't have all the elemental spells, [[ThatOneBoss well...]]
*** Should you decide to complete the [[BonusLevelOfHell Labyrinth of Amala]] before entering [[TheVeryDefinitelyFinalDungeon the Tower of Kagutsuchi]], you are locked into the True Demon Ending but you can get [[GameBreaker Pierce]] on the Main Character. Freikugel is an [[NonElemental Physical-based Almighty attack]] that can benefit from Pierce's passive effect of going through resist, Null, and Drain physical like it's non-existent. Combine the two and you have an attack and passive skill combination that Noah cannot defend himself against.
** The [[Franchise/DevilMayCry Devil May Cry]]/[[VideoGame/RaidouKuzunohaVsTheSoullessArmy Devil Summoner: Raidou Kuzunoha]] cameo battles, both times (International versions of the game get Dante while the [[NoExportForYou Japanese Special Edition]] has Raidou Kuzunoha). The first battle with either cameo is mandatory regardless of which ending you're going for and the cameos love using a Physical skill that ''not only has an insanely high crit rate, but is also impossible to dodge!''
* [[spoiler:Captain Jack]] in ''VideoGame/ShinMegamiTenseiStrangeJourney''. If you can't deal damage fast enough between his rounds of healing roughly 1,000 HP, you might as well reset and either rearrange your demons or go grinding.
* ''VideoGame/ShinMegamiTenseiIV'' has the optional Fiends, which require nothing short of sheer determination to summon. Even if you know where they appear, they still have a measly 1/256 chance of appearing every time you enter the area they're in. It can take hundreds of attempts over hours or even ''days'' just to get a particular Fiend to show up. On top of that, Fiends are absolutely brutal bosses, and if you get clobbered, you have to either pay Charon to revive you on the spot (which guarantees their reappearance), or if you can't afford that, have to slog through the process of summoning them all over again.
* ''VideoGame/ShinMegamiTenseiIVApocalypse'':
** The BonusBoss Izanami. She isn't particularly hard to defend against even if you immediately go after her as soon as her respective sidequest opens up; as long as you have a good demon composition and use your secondary partner Hiroshi's abilities strategically (his attack can ''remove Smirk''), she's not terribly hard to defend against. The main issue is that she has Diarahan, a fully-healing spell; if you can't damage her fast enough, she will eventually use it and undo all of your efforts.
** In the main storyline, Azrael. Not too terrible a boss on his own, but simply getting to him is a pain. After the last point where you can save before him, you have to watch a four scene long cutscene. After that, there's a two part Horde fight. Only after beating the second Horde can you fight Azrael, who has two phases, gives no Assist Gauge for your party for plot reasons, and switches between reflecting physical and magic each turn, and not following his pattern can easily cost you a set of turns. If you do lose, you start over at the cutscenes and Hordes.
** Some of [[BonusBoss the Fiends]] try to stall the fight so they can kick you out after ten turns, forcing you to got through their sections of Twisted Tokyo again. Three take the cake:
*** David, the first Fiend. In his second phase, he keeps using Makarakarn each turn, covering his weakness. Couple that with his unique debuff Haunting Rhapsody, and it might take numerous trips to beat him.
*** Black Rider, the fifth Fiend. His unique Stance move takes off two Press Turns instead of one, and he comes with Calibrate, which buffs hit/evade rate by three, and Dekaja, removing all buffs. If you let him Smirk, he uses Antichthon, dealing heavy damage and debuffing your party.
*** The DLC Fiend: [[spoiler:En no Ozuno. Unlike the rest of the Fiends, En no Ozuno is a Puzzle Boss that remains annoying each fight. In addition to hitting hard, he can counter attacks with Peacock Incantation and, in his second phase, fully buff his defense and hit/evade rate with Goki's Water Wall. Finally, he has Dekaja. He's weak to Physical, but countering his buffs and resetting your own buffs will waste your turns, forcing you to trek through the longest part of Twisted Tokyo numerous times]].
* [[FinalBoss Hari-Hara]] from ''VideoGame/DigitalDevilSaga'' isn't too bad in the first form, but the second form is made ridiculous by [[FlunkyBoss the numerous floating cores that accompany it.]] Each core absorbs its respective element (making group attacks out of the question), and gets a turn of its own and will deal a single target, high level attack - so pray to Vishnu it doesn't hit a certain member's weakness if you haven't excessively prepared for this battle. Thankfully, all but one of the cores are weak to the opposing element, but if you defeat a core Hari-Hara will regenerate it or another fallen one the next turn. Oh and Hari-Hara itself likes to dish out random status ailments with Vanity, making it harder if you thought you could get lucky with Cielo in your team. Hari-Hara can also trip you up by using Hunger Wave, which can inflict the Hunger status on everyone.
** One way of preparing for the first game's ultimate boss involves soloing most of the game as Serph. Not terrible for the most part provided you grinded to get the various Null abilities and Ragnarok, but the final fight with Bat/Camazotz is an utter pain no matter what you do. His gimmick is that he can turn you into a bat, who has reduced stats and minimal strength. And he does this frequently. Because you only have one character, you become virtually ineffective. What's worse is that the Bat status, due to being exclusive to this battle, isn't covered by Null Ailment, and to add insult to injury, the move heals Camazotz.
** Ananta and [[BonusBoss Orochi]] aren't too terrible boss fights if you come prepared. The catch is that the former has seven turns and the latter has eight turns, and each attack has its own animation. While there are ways to get around this, if you don't know them, the battles will go on for a while.
* The boss on the DLC of ''VideoGame/LostOdyssey'', Killalon, is incredibly irritating. For starters you have to run down 25 floors of dungeon before you can fight him, with no save points. Although he doesn't have that much HP, the fact that he regens it a lot makes him hard to kill, and as you near-constantly have to protect your characters from his moves any damage you do will likely be recovered. Even with 5 level 99 characters and the best skills in the game, defeating this boss is somewhat reliant on what moves he actually decides to cast.
* ''VideoGame/{{Touhou}} Project Pocket EVO+'' "story fights" generally consist of one of your characters against a single opposing character. Sometimes this is otherwise a perfectly normal fight. Sometimes the opposing character has a Defense-increasing or healing spell card and ''will not stop spamming it''. That is mainly because healing spells in this game heal a set percentage of max HP. Given bosses' sick amounts of health, even one usage of it can remedy whatever you did during the last five turns. And thanks to the game's spellcard system (using a spellcard disables it until you decide to use your turn to restore it), they can use it ''every second turn''. EVO+'s UFO system makes it ''even worse'' - if the enemy gets a green UFO, you have to take it out with a successful attack - if you don't, she regains 20% of her HP at the end of current turn. So if the [[RandomNumberGod RNG]] [[MarathonBoss isn't on your side...]]
* ''Franchise/{{Pokemon}}'':
** Trying to catch practically any Legendary Pokémon will make them this. Knocking out a Legendary is easy, catching one is an exercise in frustration as they all have the lowest catch rate possible and you have to sustain continued attack from their moves while trying to catch them. It is not unusual to go through up to 30 Ultra Balls and Timer Balls or cause the Legendary to run out of PP causing them to faint from Struggle as the RandomNumberGod proceeds to not let you catch them. The only real exceptions are Legendaries that are plot mandatory to catch plus the Gen VII Mascots in ''Ultra Sun And Ultra Moon''.
** Erika from ''VideoGame/PokemonRedAndBlue'' can qualify as this, with two of her three Pokemon knowing the Wrap/Bind moves (which, back in the day, did continuous but light damage over the course of 2 to 5 turns) and two of them using [[StandardStatusEffects the status-inflicting Poisonpowder and Sleep Powder]]. Wrap/Bind was obnoxious because it prevented switching and forced the player's Pokemon to stay in for however many turns it lasted for, all just to do a pittance of damage. And while Poison and Sleep are easily cured with Antidotes and Awakenings, it forced the player to waste a turn dealing with the status. This could make Erika very annoying if the player's Pokemon were unable to take hers out in one shot.
** Among the [[OlympusMons legendary]] catchable pokemons from the same game we have Moltres. It only has two attacking moves, Peck and Fire Spin. Fire Spin not only does continuous damage each turn but it prevents the Pokémon affected from switching out and in Gen I attacking.
** Falkner from the original ''VideoGame/PokemonGoldAndSilver'' can also be this, due to both of his Pokémon knowing Mud-Slap, an accuracy-lowering move. And said move is super-effective against Geodude and Onix, who otherwise have a type advantage against Falkner's Pokémon. (Not to mention that Geodude and Onix are generally slower and acts after Falkner's Pokémon.)
** There's also Pre Gym Leader Justy from ''VideoGame/PokemonColosseum'', who uses a combination of Double Team, Sand Veil and Dig to keep you from hitting him. This leads to a tedious battle of spamming Faint Attack with Umbreon (if you taught it that; the Bite it comes with is usually more preferable) or Swift with Espeon (which no one does since it comes with Return).
** Candice in ''[[VideoGame/PokemonDiamondAndPearl Pokémon Platinum]]'', specifically. Her Froslass has the ability Snow Cloak, which ups its evasion by 20% in hailstorms, which her Abomasnow will cause hail to be permanently in play. Froslass will follow up by using Double Team numerous times to increase its evasion even more. The only saving grace is that she'll likely go down in one or two super-effective hits if they connect.
** Grimsley's rematch team in ''VideoGame/PokemonBlack2AndWhite2'', mainly for Liepard. It's already fast enough, but it has the Unburden ability on top of that. It'll always start with Fake Out, which will consume the Normal Gem it holds and makes it go even ''faster'', as well as wasting a turn by flinch (unless your mon has Inner Focus). Then it'll screw with you more because it knows Attract, which causes a status effect that wastes a turn half the time- and since this Liepard is female, and many species of mon have skewed gender ratios in favor of males (especially the starters)... you can expect to not be able to fight half the time. And it also knows Sucker Punch to go first if you're using a move (given that there's a good chance that you'll be unable to attack), just to make things more annoying. And this is his first mon.
** Also in ''Black 2'' and ''White 2'' in the Pokemon World Tournament: Winona, specifically her Altaria. While most of the gym leaders will either give you an even battle or [[ThatOneBoss or just murder you outright]], Winona's Altaria seems designed specifically to cause hair pulling. Of it's four moves, only ''one'' is damaging (Dream Eater) and it only works when your mon is sleeping. The others put your Pokemon to sleep, preventing them from attacking and making them vulnerable to Dream Eater (Sing), recover health (Roost, and also Dream Eater if it works), or boost Altaria's defense (Cotton Guard). So a typical battle has her put your mon to sleep with Sing, heal any damage you may have done with Roost, and then bulk up with Cotton Guard and proceed to use Dream Eater until your Pokemon wakes up, in which case you had better hope you get a Super Effective Critical Hit before you get put to sleep again. It's not quite ThatOneBoss, because unless your mon is extremely vulnerable to Dream Eater, Altaria can't cause much damage, but its moveset seems basically designed to drag the match out as long as possible and make you waste all your good moves trying to KO Altaria before it can heal itself.
** Deoxys in ''Omega Ruby'' and ''Alpha Sapphire''. Before you can even encounter it, you have to go through capturing Rayquaza, battling [[spoiler:Zinnia]] (who can be defeated in two minutes), and sitting through several minutes of cutscenes, all without saving. Once you finally get to Deoxys, it's a pain if you're trying to capture it. Deoxys is so strong that it can easily obliterate your Mega Rayquaza in one hit with Psycho Boost, and Hyper Beam can deal some serious damage as well. Then it starts spamming Cosmic Power to buff its defenses and Recover to heal any damage you can deal to it. And if that's not all, it also has an abysmally low capture rate and just will not let itself be captured. If you didn't use your Master Ball, there are two options: KO it and come back later [[note]][[GuideDangIt there's no indication]] it won't be lost if you knock it out, and trying again requires you to re-enter the Hall of Fame and return to Sky Pillar[[/note]], or despair endlessly trying to capture it the first time around. Remember: you have to sit through ten minutes of battles and cutscenes before you can fight Deoxys.
** Primal Groudon from ''Omega Ruby/Alpha Sapphire'' is not especially hard to defeat, but catching it is extremely difficult. Fire-Ground, as a type combination, has precisely two weaknesses out of seventeen types. One of those is Water, which is cancelled by Groudon's ability and, if you have means to subvert that ability, would likely kill it dead instead of weakening it appropriately. And when you do weaken it... It knows Rest. Which restores all HP. So basically, if you want to catch it, you have to weaken it about ten times over. And unless you have a Ground type on hand (and Primal Groudon has a ''very'' high Defence stat, which most Ground moves would go up against), you're going to be doing normal damage to it at best. As said, making P. Groudon weak is doable. ''Keeping'' it weak is a headache. Like any Rest-abuser, moves like Worry Seed and Heal Block will stop it being able to heal... but those are moves with very specific applications, and even if you have a Pokemon that can learn them there's a very reasonable chance you simply don't have them learned right that moment.
** Any and all roaming Pokémon, no matter the game. For starters, [[GetBackHereBoss they run at the first chance they get to a random spot on the map]], which changes when you go to a different route or town/city. Next, they're all [[OlympusMons Legendary Pokémon]], meaning that you only get one chance per match to catch a Pokémon with the lowest possible catch rate. Thirdly, [[YouWillNotEvadeMe trapping moves like Mean Look]] only work so long as the user remains in battle (outside of using Baton Pass), and trapping abilities only work if the Pokémon was sent out at the start of the fight. Finally, if you want a certain kind of Nature and/or Hidden Power type on them (such as a Timid Raikou with an Ice-type Hidden Power), [[SarcasmMode you'll be pleased to know]] that their Natures, [=IVs=] etc. are all decided not when you first battle them, but as soon as they start running around the map, and the only way to reset them afterwards (from ''Platinum'' onwards) is to KO them and beat the Elite Four again to make them respawn, hoping above hope that the next spread is what you're after. Thankfully, statuses and damage inflicted remains when you run into them again, and the Master Ball makes catching them after you hunt them down easier, but [[TooAwesomeToUse there's often only one per game, and there are more than one of these arseholes]].
*** Raikou and Entei are perhaps the worst roaming legendaries. In addition to all the points listed above, they also know Roar -- meaning that if you manage to stop them from fleeing, they'll try to make ''you'' run away instead. Even worse, if they pulled this off in ''[=FireRed=] and [=LeafGreen=]'', [[PermanentlyMissableContent they would disappear entirely, preventing you from ever catching them]]. Oh, and while roamers are entirely optional, if you want Ho-Oh in ''Pokémon Crystal'', you need all the beasts; these two included.
*** The legendary Kanto birds in ''VideoGame/PokemonXAndY'' are a new breed of roamers -- this time, they'll split before you're even allowed to send out your Pokémon. You need to hunt them down around ''ten times'' before they finally settle down for good in Sea Spirit's Den, where they can be fought without running away.
** Tapu Fini in ''VideoGame/PokemonSunAndMoon'' will test your patience to the extreme. First off, its ability automatically summons Misty Terrain, meaning you won't be able to inflict status on it for five turns. It has Aqua Ring to regenerate the damage you do to it, on top of having very good defenses and a strong defensive typing making wearing it down harder. It also has Muddy Water to wear you down and lower your accuracy, and Hydro Pump if it feels like just killing you instead. Park a Grass/Dragon/Water-type in front of it to resist the hits? It has Nature's Madness, which halves your HP and puts you in danger of being knocked out even with the type resist. The only thing keeping it from being ThatOneBoss is the fact that it doesn't hit as hard as the other Tapus, the Ultra Beasts, or the cover legendaries, making it merely annoying instead. Expect to sink a while into catching it, and god help you if you're resetting for natures and whatnot.
* Pretty much every boss in ''VideoGame/EndlessFrontier''. Each and every one of them (And there are a ''crapton'') has lots of team-hitting attacks, [[ScrappyMechanic Forced Evasion]], Some really tough flunkies and enough HP to eclipse Bill Gate's total income four times over. Granted, So do normal enemies, but not to the ferocity bosses do. Expect to spend a solid half-hour fighting a boss.
* ''VideoGame/BatenKaitosOrigins'':
** The afterling under the Celestial Tree in . You have to cut its roots before [[DarkActionGirl Valara]] can kill it. This is easier said than done. For one thing, the afterling inexplicably attacks Sagi's party, as opposed to the person who's trying to kill it. Also, it'll occasionally shift its posture so that your party can't hit it without killing it; with the way the game's targeting system works, however, it's possible for the thing to shift ''just'' as you attack, resulting in you unleashing an EX Combo against it and killing it. Finally, when you do cut it loose? Valara kills it in the following cutscene. This fight doesn't compare to the pain the [[ThatOneBoss Holoholobird]] put you through, but it's frustrating and the solution is counterintuitive.
** The Hearteater you fight in the Matar Highlands. It has quite a bit of HP and hits fairly hard, but the real problem is its special, Ovulate. This infests a character with the thing's eggs, and puts a timer on them. When the timer runs out, the eggs hatch and devour the party member (read: OneHitKill). Basically, you can either burn up your MP using the Chalice of Freedom, or you can just revive whenever someone goes down (pretty much constantly).
** [[HumanoidAbomination Wiseman]]. His regular attacks drain both your health ''and'' your MP. Meanwhile, one of his specials, Cast Away Your Carnal Robes, knocks your whole party down, removes any magnus you've equipped, and breaks your combos. As a result, you're gonna spend most of the fight trying to keep his HP down and struggling to assemble a decent combo, while he uses your stolen MP to hit you with special after special. Adding to the pain, he comes immediately after the brutal showdown with the Black Dragon. Thankfully, most of his attacks are fairly weak; his strongest attack, Illusory Chaos, does maybe half your health in damage, which is easy to recover from.
* From ''VideoGame/DarkSouls'' we got Lost Izalith's boss: The Bed of Chaos. You don't get to fight it directly, instead you got to rush through the arena in order to destroy 3 weak points that go down in one hit. However, as the fight progresses, the floor will crumble and the boss will start spamming hard-hitting and night-unavoidable attacks that can easily knock you down into the freshly opened BottomlessPits. Fortunately, every time you destroy a weak point, it stays destroyed even if you die or [[EscapeRope warp back to a bonfire]], which is actually a more viable strategy than trying to destroy the 3 targets in one go.
** The Stray Demon, a PaletteSwap of the [[WarmUpBoss Asylum Demon]] found in the revisited Undead Asylum. Like the Asylum Demon, his attacks are powerful, but cripplingly slow; however, unlike the Asylum Demon, many of his attacks trigger a massive magical explosion that will wreck you if you get caught in it. However, if you get the pattern down, then it just takes forever to chip down his mountain of HP.
** The Iron Golem isn't terribly hard, but you fight him in a small arena near the top of Sen's Fortress. The biggest hazard of the fight isn't the Iron Golem's attacks, but rather the BottomlessPit surrounding the arena. It's way too easy to fall off the edge, and while getting back to the fight isn't hard if you found the bonfire at the top of Sen's Fortress, it makes it one of the game's cheaper fights.
*** ...Unless you bring in [[MemeticBadass Iron TARKUUUUUUUUUSSSSSSS!!!!]]
* The Covetous Demon from ''VideoGame/DarkSoulsII'' is slow as is most of its attacks, has a pretty big blindspot where you'll be safe from him for the most part, is susceptible to long-distance attacks, and even has Hollows trapped inside the arena that you can free and use as bait to make him vulnerable for a short period. However, what potentially makes him count is that one of his attacks deals huge damage ''and'' unequips all your equipment except items. Enjoy eluding him while simultaneously trying to rearm yourself in the menu screen.
* Both of the truly [[BonusBoss optional bosses]] in VideoGame/{{Wasteland}} - the Scorpitron and the Nightmare. Since the Scorpitron is available for you to fight pretty much from the beginning of the game, he doubles as ThatOneBoss for most players because he's a big challenge even for a party that just finished the game (but didn't spend much time on leveling up). The Nightmare, however, resides in an [[BonusDungeon optional dungeon]], and you don't have to fight him to complete it. He isn't particularly dangerous, he just has the highest HP in the entire game and you can only have one party member enter the dungeon to begin with, which makes his fight long and tedious (if not for macros and the fast-forward button). This can also lead to CantCatchUp, since he also gives the highest XP in the game for killing him (and double that if the final blow is done via melee) which can easily earn your solo character a level or three.
* Silver Horn in ''VideoGame/MegaManXCommandMission''. At first, the fight isn't too bad, and Horn has an exploitable weakness to electric attacks. But when he's at half health, he uses Liquid Coating, which raises his defenses exponentially, making the fight ''incredibly'' tedious. It also has the bonus effect of ''removing his weakness''!
* ''VideoGame/MegaManBattleNetwork'':
** [=ToadMan=] in the second game is made difficult through his incredibly obnoxious attack pattern. You will constantly have to dodge the tadpole torpedoes fired by his lily pads, often dodging the paralyzing song note that Toad will fire at you (which can shift rows to home in on you), and if [=ToadMan=] catches you in his row, he'll spring over to his other lily pad, two rows above or below him, requiring you to chase him.
** [=SnakeMan=] (also in the second game) ''loves'' to hide in his pot if anyone ever enters his row, defending himself from damage and wasting everybody's time, and he moves so fast that any non-instantaneous attacks would just be wasted. That he hangs out in the back row behind a column of holes is icing on the cake.
** [[DirtyCoward BubbleMan]] from 3. He constantly hides from your attacks behind a rock and a constant stream of bubble traps. Oh, and his Beta random encounter will only appear when you're at critical health.
** [=GutsMan=] may have been a WarmupBoss in the previous 2 games, but in Battle Network 3 he [[TookALevelInBadass becomes a fair bit more challenging]] past his first fight. He moves a little more erratically, starts carrying Area Grabs to regain ground, gains [[ImmuneToFlinching Super Armor]], and his Beta version holds a ''Program Advance'' as a DesperationAttack if not defeated quickly enough. If you see that last attack, kiss your S-rank goodbye as it lasts several seconds and you cannot damage him in the meantime.
** [=DarkMan=] in the third game deploys a series of bats through Mega's field that require constant dodging back and forth to avoid damage. These are a distraction from his ElementalRockPaperScissors nightmare -- he has 3 out of 4 elements under his control, and an attack (usually an area-consuming one, like the Killer's Eye ray or the two-row snowflake) will trigger every time you cross his path, which is what the BATS are for.
** [=ShadeMan=] always has some obnoxious damage-mitigating trick in the fourth game. In his first two plot-based fights, he [[PlotArmor can't take any damage at all]] without Dark Chips, but special consideration must go to his Omega version random-encounter, after the Boktai sidequest. He ''can'' take damage, but if you hit him ''too hard'', he'll split into four red bats that slowly retreat from the field, three of which are illusory. If you want to beat him quickly, you must figure out which one of the bats is really him and continue to pile on the attacks (and his HP counter disappears during this too)...but it's only ''safe'' to hit him while he's in the lowest row of the field, since you want to protect the Green Mystery Data[[note]]There's a version-specific Giga Chip inside, and the only other way to find it is by picking a fight with [=LaserMan=] Omega[[/note]] in the upper corner of his field (which the [=ShadeMan=]-bat will destroy if he connects with it). ''Have fun''.
** [=DiveMan=] in the sixth game spends the majority of time under the battlefield, where he can only be hit by Cursor chips. While he's under"water", he spawns missiles in two rows at a time, and only resurfaces either to immediately dip down again, or to launch an attack. While his strongest attack doesn't hit the back row, he also can launch bombs and the aforementioned missiles at you to get you into range of it. It's a drawn-out fight, regardless of his version.
* Ness's Nightmare from ''VideoGame/EarthBound'' is a grueling MirrorBoss fought only with the main character, who knows all of said character's techniques, including one that has an off-chance of scoring a OneHitKill against any enemy. Which, in this case, is an immedeate Game Over and a ticket back to the start of a dungeon full of awful DemonicSpiders. Given his significant amount of hit points and tendency to buff his defenses, his chances of triggering the OHKO only go up and up the longer the fight drags. Now, this will not be an issue if you equipped gear that blocks PK Flash attacks [[GuideDangIt (assuming you knew this already)]], but this still leaves you with a highly resilient boss whose PSI attacks hit like a truck. The only solution that guarantees victory is, simply, [[BoringButPractical to outlast him until he finally runs out of PP]]. It'll take a while.
* Dopplegangers in the VideoGame/DotHackGUGames spawn if the player stands still for too long in a field and will begin slowly chasing the player, even being capable of breaking into the battle fence of another encounter. The Doppleganger's abilities are identical to Haseo, but eight levels stronger. Because of the game's damage scaling, this means that attacks will do chip damage unless you use [[SuperMode Beast Awakening]], which negates the scaling while active but only lasts for a short time, meaning the player must recharge the gauge using Favorite Actions to damage the Doppleganger again before it can regenerate. [[GuideDangIt Or reach the level cap before you fight it, because it's affected by it just like you are.]] Defeating the Doppleganger once in the first volume, twice in the second, and once again in the postgame of the third will reward the player with GameBreaker equipment for the second and third volumes.
** The Sealed Beasts in the second and third volumes only have a tiny number of attacks, but large amounts of HP, and upon falling below around 1000 HP they will spam Ma Repth until over about 2000. Defeating them requires bringing them down to just above the threshold at which they heal and then finishing them off in one shot with [[LimitBreak Divine Awakening]].
* The higher difficulty levels in ''VideoGame/TalesOfXillia'' turn every boss into these because of HP bloat (enemy HP on hard is 250% of its value on easy, and enemies take about a third less damage as well, while only dealing about 50% more), but the two bosses who can heal, Agria and [[FinalBoss Gaius/Muzet]] really take the cake. Their healing powers increase proportional to their health, not their attack power, meaning that Agria can instantaneously recover 15,000 HP at a point in the game when your strongest [[LimitBreak mystic arte]] can do maybe half that. And they can spam these moves an unlimited number of times, and quickly enough that if the AI decides to be mean it can recover from critical to full in 5-10 seconds while still attacking occasionally. This can render these fights nearly unwinnable even for a player with enough levels, equipment, and gaming skill to render their offense trivial. Better hope you brought a *lot* of hourglasses.
* ''VideoGame/TalesOfXillia2'': Muzét [[spoiler: (Fractured)]] about halfway through the game. She has some pretty tough spells and she is the first boss to actually use a [[LimitBreak Mystic Arte]] on regular difficulty. Aside from having some annoying spells like Air Pressure or Flame Ring, Muzét ''loves'' to teleport around the field. If she's cornered, she teleports away and blasts you with more spells. Fortunately, the player did get Milla into their party shortly before and her Link Ability is to bind an enemy, which can keep Muzét in place for a bit.
* One optional boss in ''VideoGame/BravelyDefault'' [[spoiler: Red Mage De Rosa.]] His actual moveset isn't too hard to deal with - a one-target physical move, Thundara to everyone, and casting Charm and Dread occasionally. What sends him into this trope is the Red Mage's signature ability, Revenge, which has a chance to give whoever has it an extra BP (basically, an extra turn) when they take damage. This is useful for you when it happens, but considering you'll probably only have one, maybe two Red Mages out at one time, it won't activate that often. But you can probably guess what happens when you give that ability to a boss you'll be attacking multiple times a turn. He'll use the extra move that gives him to immediately cast Cura, which means you have to attack him more to undo that healing, which gives him more chances to activate Revenge and do it ''again''. If it activates enough in one turn he can tear your party apart even if everyone's at full health, which might shoot him up into ThatOneBoss if you're particularly unlucky.
* ''VideoGame/JojosBizarreAdventureThe7thStandUser'' has any boss that can change their distance to ?. This can make otherwise easy bosses like Forever and High Priestess (or an already hard boss like Chaka) take quite a while, because they take 1 point of damage ''if you're lucky'' from any attack at this distance, and usually "rest out of sight" to regain HP. They can stay at this distance for [[AIRoulette as long as the AI feels like]], and the fight is pretty much at a standstill until they come back to their regular distance.
* ''TheLegendOfHeroesTrailsInTheSky FC'' has the second fight with [[spoiler:Lorence]], who has lower damage output than before but makes up for it with more defensive tactics. Thanks to his insane SPD, he can easily spam Tearal and Earth Guard EX to keep himself alive and save up enough CP for his S-Craft, over and over again. His skillset also covers at least three status effects, which means anyone who doesn't have Grail Locket will be vulnerable to at least one effect. This makes for a tedious and somewhat luck-based battle, especially on Nightmare difficulty.
* Actually a plot-point in ''VideoGame/{{Undertale}}'': [[spoiler:Sans, who is]] the final boss of the No Mercy route, intentionally tries to make the battle as annoying as possible, because he knows that you can just reload, so he must make you quit of your own free will. [[spoiler:Sans]] only has 1 health point, and his attacks only do 1 damage, but his attacks ignore MercyInvincibility, take up wide areas, and deal DamageOverTime. To make things worse, he does many unexpected things, like dodging every single attack [[spoiler:while he's awake]], starting the battle with one of his most devastating attacks, at one point offering to spare you but immediately killing you if you accept, doing damage if you don't move quickly during your own turn while deciding what to do, and finally using his special attack, where he [[spoiler:does absolutely nothing. And because he's doing nothing, it's still his turn, so you can't hurt him either. Until he falls asleep]].
* ''VideoGame/XenobladeChronicles2'': The fight with the Phantasms in chapter 7 isn't particularly dangerous; a properly leveled party won't really be in any danger of dying. The problem is that there are a ''lot'' of phantasms, and each one is capable of summoning another phantasm when low on health, which in turn can summon ''another'' phantasm, meaning that the battle is going to drag out for a ''long'' time unless you manage to wipe them all out at once. Unfortunately, doing so is nigh impossible because [[GeoEffects the fight occurs in a dungeon that prevents you from using your most powerful attacks]]. Eventually they stop respawning, but you'll spend quite a lot of time killing them before you reach that point. It doesn't help that they tend to spam [[MostAnnoyingSound the same two attacks]] over and over.

[[folder:Shooters/Shoot 'Em Ups]]
* ''{{VideoGame/Touhou}} 13: Ten Desires'' has the Stage 3 boss, Miyako Yoshika; her spellcards are in no way considered hard, but for her final spellcard, she surrounds herself with knifes and heals herself. Since the pathway to get around the knives is just as long as dodging them and going to stop Yoshika healing, fighting the battle either way is irritatingly long.
* Glorious Symbol from ''VideoGame/{{Hellsinker}}'' serves as the Segment 2 Behind boss and while he isn't particularly difficult by the standards of the game, he takes a somewhat long time to defeat. While the other bosses of Segments 1 through 3 can be killed quickly just by hitting their central components until they explode, Glorious Symbol requires you to repeatedly destroy its 4 cores until it finally explodes, something that can easily take over two minutes. Worse yet, you can't just skip him by playing Segment 2 Lead to fight Scarlet Queen on your first playthrough; to earn the privilege of playing the Lead stages, you have to complete Segments 1 through 4 on your first credit.
* The bosses of ''VideoGame/DeaeTonosamaAppareIchiban'' are usually a letdown (even the final one) because of the absurdly over-powered SuperMode of the main characters. However Abra Kadabra, the fat sultan, is the only one that must be fought differently. He hovers on a FlyingCarpet and can't be hit, not even with smart bombs - the only way to damage him is to hit the oil drums he rolls every now and then on the floor. Too bad that he uses fire magic that burns the player (including an annoying fire dragon that follows him) and is timed in a way that he usually drops the drums when the player is engulfed in flames and unable to hit them. It is a long and tedious fight as opposed to the ridiculously easy other ones.

[[folder:Simulation Game]]
* ''VideoGame/NavalOps: Commander'' has the Archaeopteryx, which is a big airplane. It is extremely fast, VERY hard to even hit and follows a "hit-and-run" tactic.

[[folder:Stealth-Based Game]]
* ''VideoGame/MetalGearSolid'' has two:
** The M1 Tank. It goes down in only a few hits and does ''much'' less damage than you'd expect frigging ''tank rounds'' to do to a man in a sneaking suit but the problem is you have to engage it with grenades, the single most unused weapon in the game. Odds are you haven't even tried them out once by this point in the game, so expect to take a rather cruel beating from it until you get good enough with them to toss them through the hatch.
** The second Sniper Wolf battle, provided you don't cheat and use Nikita Missiles. Wolf has a rather huge area to hide in with lots of cover while you... don't. Odds are she'll spot and land a hit on you before you manage to even locate her, let alone zero her in your sights. When this happens your only choice is to run for cover and wait until she loses sight of you, and then try again.
* ''VideoGame/MetalGearSolid3SnakeEater'' has two as well:
** The SniperDuel with The End. Even without the KonamiCode cheat or [[ItMakesSenseInContext simply waiting a week]] he's not exactly difficult, but the fight just drags on forever since the area is so massive and it can be tricky to line up a shot on him even when you know exactly where he is. Of course, some fans consider him to be one of the best bosses in the entire series, due to the long and patient cat-and-mouse game, and for those who don't, thank Kojima for the AntiFrustrationFeatures.
** The Ladder that you climb to reach Groznyj Grad. Yes, the fanbase [[http://metalgear.wikia.com/wiki/Bosses#Metal_Gear_Solid_3:_Snake_Eater actually considers it a boss]]. All you do is hold up to climb a ladder, with no enemies or conflicting obstacles whatsoever. ''[[https://www.youtube.com/watch?v=RCRckk97bhk For a solid two minutes.]]''
* ''VideoGame/MetalGearSolid4GunsOfThePatriots'' has the battle with the sniper Crying Wolf (It's just par for the course with sniper battles), who engages you in the same snowfield as Sniper Wolf but this time with an armored suit, a rail gun, and reinforcements. Your choice to fight her boils down to a rather patient game of cat and mouse in the snow, or [[GoodBadBugs just hiding under the truck]] for like 3 hours and landing a hit every time the opportunity presents itself.

[[folder:Survival Horror]]
* ''VideoGame/RuleOfRose'' has the Mermaid boss, which isn't necessarily ''difficult'', but the fight can get so drawn-out and monotonous that you mess up out of frustration. Come to think of it, boss fights in general aren't the game's strongest suit....
* ''VideoGame/HauntingGround'': The final fight against Lorenzo isn't all that hard (especially if one saved a lot of Magnesia), but Lorenzo's annoying tendancy to suddenly stop and gloat, then proceed to troll Fiona by blowing up the floor at her heels to send her flying becomes plain annoying after the twentieth time it happens. His high health (which is invisible to the player, by the way), tendency to turn on Hewie, teleport ''on top'' of Fiona to push her into panic, the small size of the arena and his ability to one-hit Fiona at the most random times (panic mode or not, he doesn't care!) only makes it more frustrating. And God help you if you don't have any Health, Panic or Dog items left.
* The first true "boss" in ''VideoGame/ResidentEvil'', the giant snake known as Yawn, pops up early enough in the game when you're likely to not entirely have a good grip on the tank-like controls, and in a small room where you can very easily get trapped by his long body. Making matters worse is that you don't actually have to fight him but simply make a break for the crest in the corner, but just getting there and out in one piece is easier said than done. The GameCube Remake made it possible to have Richard help you out which was even more of a double-edged sword: you were forced to take down the snake or else you'd miss out on the single most useful weapon in the game: the ''assault shotgun''.
* ''VideoGame/ResidentEvilCodeVeronica'' has Alexia in her final form. It's not a hard fight, as all you have to do is hit her once with the linear launcher, but you only have minutes to do so, as wasting too much time results in the Antarctic base to blow up, and she flits around like a fly, spewing ichor at you which causes Chris to drop his aim. Add in the slow moving aiming and the only real way to hit her is to wait for her to cross the middle of the screen and shoot.
* ''VideoGame/ResidentEvil6'':
** Since the final boss [[spoiler:Derek Simmons]] of the Leon / Helena chapter feeds on the constant stream of respawning C-Virus Zombies to regenerate, you instead need to impale a zombie with a lightning rod, damage him, let him absorb the zombie, and wait for lightning to strike him to inflict lasting damage. Ironically it's probably the [[SolveTheSoupCans most Resident Evilish boss ever]], but it also means a lot of the battle consists of first figuring out that's what you're supposed to do, and then waiting patiently for him to grab the lightning rod. It's largely random which zombie he grabs, and lugging the rod around leaves you slow and vulnerable, meaning this fight can drag on for a ''very'' long frustrating time if the RandomNumberGod decides he's not going to grab the zombie you want him to.
** The chopper from the Chris / Piers chapter. You're forced to engage it and a swarm of respawning J'avo with nothing more than assault rifles and the almost entirely cosmetic "help" of Jake and Sherry who you're helping to protect from it. Expect the battle to take at least 20 minutes before you finally drive the god-forsaken thing away, and then minutes later you hear Chris say those chilling words "it's come back to finish ''us'' off!" Cue second battle exactly like the first, except now you have a somewhat useful grenade launcher. The worst part about this boss is you get to face the exact same boss ''again'' during the Jake / Sherry, simply playing their part instead of Chris's.
* [[spoiler:Grandfather / Lord Burroughs]] from ''VideoGame/ClockTower3'', while not ''difficult'' per se, is simply beyond annoying to face. His basic attack tethers you on the spot like your own bind move and, sure enough, if he lands three it's an instant loss ([[HaveANiceDeath though one hell of a death scene]]). He also has about [[DamageSpongeBoss three olympic swimming pools worth of HP]], gains access to a ''second'' binding move at 3/4 health, and if he gets close can grab you to drain HP and [[TurnsRed Turn Red]] for a while, making his already annoying attacks even worse. All the difficulty from what would otherwise be an easy fight comes from how long it drags and that the slightest slip-up practically guarantees an instant death.
* Scarlet from ''VideoGame/SilentHillHomecoming'' is a literal ''nightmare'' to fight if you don't grab the very-easy-to-miss crowbar from Hell's Descent prior. Without it you're stuck engaging her with the Axe (which is too slow to connect) and the Pipe and Knife (which both do ScratchDamage at best). Have fun [[DamageSpongeBoss whittling both her forms down]] for the next hour and good luck dodging her OneHitKO attack!

[[folder:Third Person Shooter]]
* ''VideoGame/GearsOfWar 3'' has the Lambent Zerker. She's actually a pretty climactic battle in campaign, where she shows up only once at the end of a frantic defense of fortress at Anvil Gate. Her appearance in Horde Mode is another matter entirely. She has the opportunity to show up every tenth wave, and is one option of five that can be selected at random (the others being a [[BullfightBoss regular Berserker or two]], a [[FlyingMook squad of]] [[MadeOfExplodium Reavers]], four or five [[BodyHorror Gunkers]], a squad of Savage Corpsers, or a lone [[KingMook Brumak]]). The Lambent Zerker is easily the worst of the lot because of her staying power--she is vulnerable only when she opens her chest plate (which, if the mood strikes her, may be once every 60 seconds or more), and even then is a DamageSponge of mythic proportions. She also has the tendency to charge willy-nilly around the map, casually smashing the fortifications you've spent the past nine waves saving up for. The worst part is that Gunkers and Brumaks are tougher enemies, while a regular Berzerker is a more strategic fight--the Lambent Zerker isn't very hard, just annoyingly durable.
* The original [[VideoGame/StarFox1 Star Fox]] has its alternate final boss, [[spoiler: the Slot Machine.]] This box is a mixture of this, PuzzleBoss, MarathonBoss, and LuckBasedMission. This boss does not have a health bar and is pretty much one hit killed. But... it's HOW you do it. [[spoiler: You need to get Triple Sevens. This is EXTREMELY annoying to do, as the game DOES NOT SHOW ANY MERCY WITH THE REELS. You CAN heal if you get Cherries, but you get attacked if you get an Andross. And Andross overrides Cherry. Oh, and the ending you get? Yeah, you can only get out of it by resetting or dying to the enemies that come. And if you die? You do the level ALL OVER AGAIN, INCLUDING THE SLOT MACHINE.]]
* [[VideoGame/WarFrame Warframe]]:
** Alad V could certainly count. Interface screw? Check. Weak point that's hard to hit? A dog robot that leaps around acrobatically counts. Frequently runs out of range? See the aforementioned dog robot. Incredibly high HP? Check. Taunts the player? [[MostAnnoyingSound Yes.]] Repetitive mechanics? You bet your ass. Not to mention that he is the ONLY remotely reliable way to farm Neural Sensors, a resource needed to craft three especially important and valuable items (Catalysts, Forma, and certain helmets) that you will probably need several dozen of.
** His [[TheCorruption Mutualist form]] manages to be even more annoying. In this case, he is only vulnerable when he uses his collar to control one of the other Tenno in your group, which he rarely does. At this point, while you're trying to damage him, you also have to avoid another Tenno trying to kill you, which depeding on the Tenno being controlled can be really difficult.
** Tyl Regor isn't much better. All of his melee attacks have a high chance of [[CycleOfHurting stunlocking]], and his shields recharge almost instantly. This wouldn't be a problem if he didn't have FlashStep TeleportSpam. He's no match for PurposefullyOverpowered weapons, but if you don't have any prepare for a grueling fight.
* Arch Azul from ''VideoGame/DirgeOfCerberus'' had a real stupid gimmick. He's immune to projectiles. This includes Bullets. Dirge of Cerberus is a Third Person Shooter. The options you have available to you? Magic which does jack shit, and your melee attack with is Jack shit jack. The third option (the right way) is to transform into your monster form and fight back. This causes one of two things to happen, according to LetsPlay/TheDarkId: Either you beat the crap out of him and his A.I. shits the bed, or you get stunlocked to death.
* The Super Bean from ''VideoGame/PlantsVsZombiesGardenWarfare 2''. It's a ShieldedCoreBoss who has a forcefield that must be taken down in order to damage it, and it regenerates it after enough time passes. ''Also'', it will liberally use TeleportSpam and FlashStep in order to avoid damage making it a pain to whittle its health. Super Bean's attacks are no slouch either, annoying hitscan EyeBeams, a cape spin, and a big, damaging laser it will use when near death. The good news is that you have four Super Brains assisting you in this fight, the bad news is that it can appear as a DegradedBoss in the Endless Flag mode.
* ''VideoGame/Splatoon2'': has Octoshower. It isn't too bad the first time you fight it using the Charger, but fighting it again with different weapons is a major pain due to the fact that none of them have the range or damage of a Charger. This makes it incredibly time consuming to fight, since you ''will'' waste a bunch of time riding the rails towards it only to not get ''quite'' close enough to do any damage. The fact that it [[GetBackHereBoss constantly moves around the arena]] only magnifies the frustration.

[[folder:Turn Based Tactics]]
* [[DualBoss The Incubi]] in the tactical strategy ''VideoGame/{{Odium}}''. They are pretty weak and their attack cannot really harm you (they launch exploding spheres which explode after a few turns, so if you keep your men away from them nobody will ever get hurt.) But their animations are horribly slow (and they attack twice per turn), and they happen to have a movement rate just a ''lil' bit'' faster than all of your men, which means that most of the fight will consist of you chasing them down and trying to get them into range of your weapons so that you can just ''barely'' scratch them while waiting through the horribly slow enemy turns. (Oh, and each sphere explodes individually at the beginning of the enemy turn, further bogging it down.)
* ''VideoGame/SuperRobotWarsOriginalGeneration'' has the R-Gun Rivale. Comes near the end of the level when your characters are all fatigued out, regenerates energy and life, has a force field, and has an attack with very high range. You may use a strategy that sucks up all his energy and hence can not use his ultimate attack (for a time, at least, since he regenerates energy), but he has a backup in the form of Gundam's funnel-like weapons. He has 50 uses/durability for it, though. Do not play on an empty stomach. This branch of the SRW series seems to specialize in such bosses, often prompting tactics that end up gamebreaking in other games (where bosses aren't such insane damage sponges)
* In Chapter 23 (the Lloyd version) of ''[[VideoGame/FireEmblemElibe Fire Emblem: Blazing Sword]]'', Lloyd Reed goes from a borderline AntiClimaxBoss in Eliwood's path to this kind in Hector's. If you don't find out beforehand that [[spoiler:not only has he moved to the middle of the map amongst hordes of other mooks, but that '''he also moves when approached''']], you're very likely to to pay for it with a dead ally. And the chapter objective is to defeat Lloyd, so if this happens too soon, it's either restart or miss out on the rest of the goodies in the chapter. Oh, and all this occurs in FogOfWar. '''''Fun.'''''
** Kishuna the Magic Seal from the same game. He's incapable of harming anyone, but he has an absurdly high evasion rate so beating him is mostly a matter of luck, and if you don't defeat him in one turn, he warps away. Defeating him in his first appearance is required to unlock a Sidequest chapter on Hector's route that's [[WhamEpisode full of massive plot reveals]], but you'll probably need a lot of resets to do it.

[[folder:Wide Open Sandbox]]
* Half of the boss battle against Gary in ''VideoGame/{{Bully}}'' involves chasing him on a scaffolding whilst he dumps wheelbarrows full of bricks on you from above. whilst bragging about how awesome he is and how much Jimmy sucks. the second half involves punching him whilst he makes NO effort to hurt you. [[FridgeBrilliance Which makes perfect sense.]] Gary's a ManipulativeBastard who hid behind others for the entire game. Of course he wouldn't stand a chance in a fistfight against the scrap-happy Jimmy.
* The General from ''VideoGame/SaintsRow2'' is very much a Goddamned Boss. More so then Maero or Kazuo-Maero just had a huge truck and Kazuo had an easy to figure out gimmick (although, considering the timing you had to pull off, Kazuo could count too). The General is worse because he drives around a mall in a huge SUV while an army of Samedi gangsters attack you. While his fleeing never results in a game over, and his SUV can be taken out quickly if you were smart enough to bring an RPG, you may at first be left with no option then to attack him with a dinky SMG on a dinkier ATV while being bombarded with enemy gunfire.