These [[ThatOneLevel levels]] will have you beating up more than the enemies...
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* To varying degrees, ''every'' level after the first two in the NES game ''VideoGame/{{Battletoads}}'' are examples of this trope. There are some in particular that stand out, though:
** Level 3, Turbo Tunnel, is the most notorious example from the game. You have to ride a hover bike through the level, while dodging a seemingly-endless barrage of walls that will OneHitKill you if they hit. The last part is the hardest by far, as the walls move ''insanely'' quickly. It's ''easy'' compared to some of the later levels, but the [[DifficultySpike jump in difficulty]] is so sudden that many have simply given up on it and not even seen the later levels.
** Level 6, Karnath’s Lair, has a warp. Missed it (as LetsPlay/SuperJeenius did)? Prepare to rue the sight of snakes. You’re climbing those fuckers for four rooms, with instant death waiting on the top and bottom of all of them. And there’s also spikes ''in the way'' of your jumps! At least you can skip the last bit of the fourth room if you hit a spike just right.
** Level 7, Volkmire's Inferno, has a fast-paced obstacle course section where everything can kill you in one hit. Unlike Turbo Tunnel, it's not all memorization, since there are also fireball and missile barrages with totally random spacing. And if you missed the warp in Karnath’s Lair, you’re ‘’forced’’ to do it!
** Level 9, Terra Tubes. For those that tried completing this game on a real NES without savestates and such, this is the true landmark of vileness. It's not the hardest level, but by far the most annoying because of its length, FakeDifficulty, ''real'' difficulty and the inability to warp past it. The underwater swimming sections are not only chock full of the same instant-kill SpikesOfDoom found abundantly in the drier parts of the level, but {{Psycho Electric Eel}}s and [[GoddamnedBats Goddamned Sharks]] trying to knock you into the spikes, and Rubber Ducks which are surprisingly even deadlier. There is a series of four races against Advancing Wheels of Doom, and two later ones which are partly underwater, which not only require avoiding spikes, but [[TrialAndErrorGameplay prior knowledge]] of which instant-kill wheels will ram the barrier at the end of the race and which will head instead for the small niche beside it. [[https://www.youtube.com/watch?v=deVqMCohnQ0&t=2m15s Here's a video of someone doing it right]].
** Level 10, Rat Race. The concept itself isn't that bad, but it says something that it got the biggest nerf in Battlemaniacs. Having to race Scuzz, the rat that runs and falls faster than you? That's fine. The game generally makes you do that sort of thing. You have to use a laggy attack on the bomb before Scuzz ''[[TheComputerIsACheatingBastard touches]]'' it? Fair enough. But the third race is ''an unholy abomination of difficulty''. You ''cannot afford to let Scuzz get far ahead of you''. If you do, you will never see him again. The only way to do this is to keep him from moving down by using timed headbutts. Good luck consistently doing that, the damn headbutt attack has a ridiculously strict hitbox in general and Scuzz is just plain freaking fast. Even worse, a badly-timed headbutt can knock Scuzz ahead of you! Even once you're done with that, you have to take down General Slaughter, who can easily StunLock you if he gets a hit in. The level fully deserved its {{nerf}} in Battlemaniacs.
** Level 11, Clinger Winger. While not as well known as the aforementioned levels (mainly because almost nobody makes it this far), those who get there are confronted with a level so nasty the programmers must have actively hated the player to put them through it. You have to ride a speeder bike all the way through a long track, while the Hypno-Orb chases you. It naturally moves faster than you, and the only way to outspeed it is to make frame-perfect turns around the corners of the track. There is zero room for error; miss one turn, and the Hypno-Orb will crash into you and inflict a OneHitKill. To add insult to injury, this level is UnintentionallyUnwinnable when playing with two players in the US version, because the second player's bike doesn't start moving.
* Shogun's level in ''VideoGame/TeenageMutantNinjaTurtlesTheArcadeGame'' easily counts for this. Not only do you have hordes of different enemies on an extremely long level, but they all know how to work together to make your life a living nightmare. Everything from foot soldiers with every ninja weapon in the book, to tiger statues that come to life and run extremely fast and can time their jumping attacks to counter your jump kicks unless you have perfect timing and take about eight or so hits before they finally go down. After all that, you get to fight Shogun, a ghost ninja who can teleport and has a hatchet that can reach considerably further than your weapons can, meaning that it's extremely dangerous to fight him close up. He also swings his weapon at an angle that can counter your jump kicks if you don't time them well. When he loses about half of his health, his head will fly off and start attacking you independently of his body, meaning you have ''two'' problems to deal with, and if you defeat him, you get the privilege of going to the Technodrome [[{{SarcasmMode}} where the "real" fun begins.]]
* Roxy Richter's level in ''VideoGame/ScottPilgrimVsTheWorldTheGame''. Enemies that come in droves, including the superfast, superdamaging Ninja foes. Plus, the recoverry shop doesn't show up until about 2/3 of the way through the level, and Roxy herself, while not quite ThatOneBoss, is no pushover.
** The second half of the Katayanagi Twins level. Platform jumping on very small platforms, annoying enemies in droves, and ''no shop at all''.
* Full Moon in ''VideoGame/CastleCrashers''. The [[{{BlackKnight}} Black Knights]] that live there are very powerful and numerous, they're set as Heavy so juggling them is harder, and you don't have a whole lot of room to maneuver.
* The fifth level in ''VideoGame/GodHand'', which starts NintendoHard, proves to be inexpressably frustrating very quickly. One sequence sees you forced to play a cannon-shooting game in an attempt to sink pirate ships; the more you sink, the less enemies you fight in the InescapableAmbush following, but due to the lousy controls of that game, good luck sinking any. Oh, and at the end of the level, you fight Demon Elvis, who's so hard that the entire next level is easier. Fun...
** There's a worse one, though: Level 7, Stage 2, "The Flying Pyramid". It's a small, self-contained arena. First wave: axe-wielding female GiantMook, cannon-wearing fat guy, {{Mook}}. Second wave: another axe-wielder, a GiantMook with a sledgehammer, and a knife-carrying skinny guy. Third wave: a mohawked GiantMook, a regular mook, ''two'' axe wielders, and a knife-carrier. Last wave: [[BossInMookClothing a Sensei]]. And there is [[CheckPointStarvation no checkpoint]]--if you die at any point, ''you start over''.
*** Don't forget Death Shudder, which is the point at which most God Hand players give up. God Hand is a game that is all about managing the number of enemies that are fighting you at any given time. So you get through the first part of Death Shudder, which has a couple Kung Fu Mooks (though if you don't approach them in EXACTLY THE RIGHT WAY, you get jumped by a whole boatload of Giant Mooks. You stride on, thinking you've gotten through the worst of it. Not in the slightest. Once you get into the next area, the doors lock behind you, and you're met with: 3 Elite Mooks, 3 Elite Axe Women, an Elite Giant Mook, and Tiger Joe, a boss mook from earlier. Not to mention the fact that they all rush you as soon as you enter the room, and when you kill the Tiger Joe, it spawns a Trident Demon, yet another boss from earlier in the game capable of completely ruining you. Worst part? That Trident Demon is ''scripted'', unlike most of the other demons in the game.
* ''VideoGame/MadWorld'' gives us the Castle Dungeon. The key to the game's fun factor is offing mooks in all manner of unique, vicious ways. The Dungeon only has one way to kill enemies you haven't seen before (the statue). What's more, much of the level consists of very small rooms and hallways, making it hard to manuever in pitched battle - which you will get into, as the enemies are [[GoddamnBats zombies]] and [[DemonicSpider gardeners]]. They'll frequently mob you as you try to battle the GiantMook Big Long Driller. Oh, as for Mr. Driller, the level's challenge is to shove five candlesticks into him - which can only be done while he's catching his breath, which he only does when wounded or after several attacks. But odds are good you'll get mauled by gardeners on your way to putting the candlestick in his back. Pull all of this off? The boss is [[ThatOneBoss Frank]]. Enjoy!
* In ''VideoGame/GriefSyndrome'', a ''Anime/PuellaMagiMadokaMagica'' fangame, H.N. Elly (Kirsten)'s stage is ThatOneLevel for many players at various levels of skill. All but [[SentryGun four enemies]] in the stage are LedgeBats, generally hovering around BottomlessPits and intermittently electrified floors. Most of them are also DemonicSpiders. (Note that, while [[NonLethalBottomlessPits falling into a pit is technically only two-thirds as lethal as dying]], the character will NOT be [[MercyInvincibility invulnerable to attack]] immediately after the [[BottomlessPitRescueService Bottomless Pit Rescue Self-Service]] is done, giving inadequate time to properly dodge.) Anyways, these GoddamnedBats mostly appear in swarms, which, in addition to the usual problems that come with trying to fight off large numbers of enemies at once, has the effect of making it difficult to see what they're about to do. The swarming is also a problem because enemies (but not the player!) can travel beyond the visible part of the screen; and, since they attack with fast horizontal lunges that cover more than half a screen's length (while the player is often restricted to one screen by RatchetScrolling), this often results in taking potentially lethal amounts of damage seemingly out of nowhere. This makes them {{Ambushing|Enemy}} LedgeBats. And since they lunge so far, you better believe at least ONE of them is going to end up off-screen. You know, other than the [[RespawningEnemies the ones that periodically spawn off-screen]], immediately fly onto the screen (which, of course, is an attack), and then [[UnblockableAttack drop a TV set on you]]. Also, lunging enemies start dealing CollisionDamage as soon as they start to attack, i.e. possibly before you could react to seeing them move, so God help you if you try to move past an enemy when it or one of its brethren, hidden amongst the swarm of enemies and/or by the ObstructiveForeground, decides to attack. Oh, and if you do react quickly enough to dodge, make sure you don't do so by jumping directly into another enemy lunging across the screen. Oh, also try to avoid jumping right into a pit or onto a patch of [[DeadlyWalls deadly floor]]. Remember those?
** Like everything else in ''VideoGame/GriefSyndrome'', the enemies in H.N. Elly's stage are MadeOfIron at higher difficulties. Even worse because your attacks will knock them out of range (they stay airborne) instead of killing them. They'll then proceed to sneak through the ObstructiveForeground or fly off-screen, and you probably won't see them again until they're flying straight at you.
** And has anyone mentioned that [[CharacterSelectForcing some characters are more]][[DenialOfDiagonalAttack ...vertically challenged...]][[CharacterSelectForcing than others]]?
** Oh, and let's not forget [[ThatOneBoss the Stage 3 boss]] herself. [[AlienGeometries The battlefield itself is difficult to negotiate]]: a narrow room that [[WrapAround wraps around]] vertically, with two pairs of uncomfortably small [[HighAltitudeBattle floating platforms]] to stand on (and one pair that just impedes your movement), while H.N. Elly and her three fake bodies [[GetBackHereBoss orbit the center of the screen in mid-air, periodically shuffling their arrangement]]. Her fake bodies will not only [[LuckBasedMission randomly alternate]] between [[LightningGun attacking]] (which cuts off portions of the already small platforms), [[CounterAttack counterattacking]] (which fills the air with melee-attack-interrupting, damage-dealing [[EnergyBall obstacles]]), and spawning the aforementioned GoddamnedBats. Luckily, she has relatively little HP for a boss.
*** At least on higher difficulty levels, where practically everything will OneHitKO you, Elsa Maria is much more of a LuckBasedMission than H.N. Elly, since [[HomingProjectile some of Elsa's]] [[RoboTeching randomly selected attacks]] [[SpinAttack are much, much]] harder to dodge than [[ChargedAttack others]].
* ''Spartan-X 2'', the Famicom-only sequel to ''VideoGame/KungFuMaster'', has a part in the final level where you have to ride a platform to your destination. The main difficulty comes from the swarms of green enemies that get dropped onto the platform at certain points in the level. If you try to handle them like regular ''Kung Fu'', you will lose a ton of health in short order, and probably get knocked off the platform to your death. Using the uppercut and finding a way to get behind all the enemies is absolutely essential to survival of the first part. Then after this comes a water segment with charging enemies and a not-too-merciful time limit to get to the final area and the final boss.
* The Trap Room in the NES version of [[VideoGame/DoubleDragonII Double Dragon II]] is a platforming DeathCourse whose frustrating obstacles include SpikesOfDoom that periodically shoot up at you, ''Franchise/{{Castlevania}}''-style rotating gears and {{inconveniently placed conveyor belt}}s as the main method of crossing over said spikes, and a rematch with Burnov on a [[BossArenaUrgency collapsing floor]]. LetsPlay/ProtonJon and heisanevilgenius took three 15-minute videos to complete it in 2-player mode.
* The full release of Creator/AdultSwim Games' ''Fist Puncher'' gives us the Green Line Subway, in which you must protect a pack of fleeing lawyers from some escaped convicts. However, if a single one of them takes a hit from anything, including you, they scream lawsuit and you fail the level. The good news is that the enemies never attack the lawyers. The bad news is that the lawyers are EVERYWHERE, and some are programmed to walk directly into your line of fire. In a game that otherwise encourages you to wreck everything that moves, it's a slow, miserable tightrope-walk.
** One of the characters, O'Grady, has his dash as an actual attack, and guess what move is extremely easy to accidentally pull off?
** The Elevated Train level by itself isn't that bad, but the main problem is the level's sidequest, getting more kills than TheDragon. At this point in the game, she basically outclasses you in nearly every level, so outdoing her can be a real pain, but you ''have'' to clear this sidequest in order to unlock one of the characters.
** The penultimate level, the Airstrip, simply because its arguably the longest level of the game, the enemies are the strongest ones yet, and checkpoints are sparse.
* The final stage of ''VideoGame/StreetsOfRage'' is filled with enemies, runaway trolleys (one of which heads straight for your direction as soon as you gain control at the start) and every boss in the game. The bosses (apart from the final one, Mr.X) all lack healthbars so there is no indication of how well you're doing against them. Additionally, that handy police backup you've had throughout the whole game? Forget it! You're on your own here. Also the 2-player jump-in option is no longer available on this stage, so if you're thinking of having a buddy join in, or if you want to do the old "Join in as Player 2 when you're near the end of your last continue" trick, you can also forget that! And don't even think of saying Yes to Mr.X's proposal...
** Reaching this stage in 2-player mode also means that 2 bosses show up instead of one.
** It's also worth remembering that the game's difficulty settings changed the amount of damage the bosses do - in Hardest, most of them can wipe out half a lifebar with a basic attack. With no police backup, this makes Stage 8 fiendishly difficult on higher levels.
** ''Streets of Rage 4'' has Level 9, the Y Building. It's a long slog through areas filled with tough enemies (such as ''several'' [[DemonicSpider Goros]]), as well as the introduction of the gun-toting [=McBride=], who like to come in packs so one can keep your attention while the others shoot you. After this is an elevator section, where the walls can be destroyed, and all the enemies are set up to take full advantage of the ability to throw you out the sides once they're gone. Get past that, and the boss is [[spoiler:Max Thunder]], who's easily just as bad as everything leading up to them.
* The driving stages in ''VideoGame/TheAdventuresOfBayouBilly''. Whereas most of the game's levels are just more challenging rearrangements of those from the [[DifficultyByRegion easier Japanese version]], these two were almost completely remade from the ground up, turning the game's fairly slow-paced and manageable midsection into a high-speed nightmare that puts the [[VideoGame/{{Battletoads}} Turbo Tunnel]] to shame. Your jeep explodes in [[OneHitPointWonder one hit]] from ''[[EverythingTryingToKillYou anything]]'', be it other cars, bombs from passing fighter planes, the mile markers along the side of the road, and especially those damned rocks in stage 4 that fly towards you with almost no warning. Oh, and there's a [[TimedMission strict time limit]], so trying to drive cautiously through all those tight turns isn't gonna get you far. Creator/NoahAntwiler of ''WebVideo/TheSpoonyExperiment'' and Website/YouTube user filmnstuff [[https://www.youtube.com/watch?v=IjRfDym50vg had a field day]] [[https://www.youtube.com/watch?v=AwzBz0Xe0b0 with those stages.]]
* ''VideoGame/TheLegendOfKorra'' has the Naga fight sequence. You have to fight 3 mecha tanks. Oh, and during the running sequence you were playing? Your health is only hits instead of an simple health bar. Most of the obstacles the tanks throw at you are either minor damage or insta-death. Have fun trying to dodge instant death obstacles while managing your health against 3 strong mecha tanks!
** In Extreme Mode, it's [[FromBadToWorse even worse.]] The tanks are powered up and are more aggressive. They throw obstacles really fast, you can take only one hit. Oh, the attacks come in complete random so you can't just memorize patterns from the tanks. Have fun.
* The BeatEmUp video game based on ''WesternAnimation/BebesKids'' is [[TheProblemWithLicensedGames bad enough already]], but the infamous haunted house maze level really takes the cake. You have to get either Khalil or [=LaShawn=] through a haunted house. Problem is, many of the rooms look similar to each other, there are too many doors (and thus too many rooms) to go through, making it easy to get lost, [[GuideDangIt the only clue that you're getting close to the exit]] is a thermometer icon that turns redder the closer you get, and you're under a time limit. (And the fact that the kids move slow enough as it is ''really'' doesn't help a bit.)
* VideoGame/DoubleDragonII: Stage 7 of the NES version. Lots of tricky platforming, and lots of very strong enemies as well. Fortunately, this stage isn't ''completely'' bad; it has SugarWiki/AwesomeMusic.
* The Bay Area in ''VideoGame/FinalFight''. It's a MarathonLevel full of the worst enemies of the game coming in big groups (one part specifically puts you against about 8 knife users at the same time) and if you manage to survive that hell, the boss of the level is easily the hardest boss of the game because he [[CounterAttack counters]] almost everything. To top all of that, he deals massive damage to you with any of his attacks, all with other [[{{Mook}} mooks]] attacking you throughout the whole fight. At least it makes up for its difficulty with SugarWiki/AwesomeMusic.