[[quoteright:266:http://static.tvtropes.org/pmwiki/pub/images/2n00x87_9574.png]]
[[caption-width-right:266:[[SublimeRhyme Boo to you, two.]]]]
'''''Luigi's Mansion: Dark Moon''''' ('''''Luigi's Mansion 2''''' outside of North America) is a {{video game}} on the UsefulNotes/{{Nintendo 3DS}}, and a sequel to the UsefulNotes/NintendoGameCube launch title, ''[[VideoGame/LuigisMansion Luigi's Mansion]]''. It was developed by Creator/NextLevelGames, who previously collaborated with Nintendo on ''VideoGame/PunchOut'' for the UsefulNotes/{{Wii}}, and was released in North America on March 24, 2013.

The story finds Professor E. Gadd researching the ghosts of Evershade Valley, but when King Boo shatters the Dark Moon, the formerly friendly ghosts start running amuck, and itís up to Luigi, armed with the Poltergust 5000, to solve this paranormal problem.

Unlike the first game, which took place almost entirely inside the eponymous mansion, there are multiple areas to explore, including a [[SlippySlideyIceWorld snowy]] mine and a [[EternalEngine clockworks]] in a [[ShiftingSandLand desert]]. Luigi has a greater amount of items and power-ups at his disposal, such as a flashlight that can reveal hidden items.

In February 2013's Nintendo Direct, this was revealed as one of several "[[TheYearOfLuigi Year of Luigi]]" games to be released in 2013, along with ''Videogame/MarioAndLuigiDreamTeam'' and the ''VideoGame/NewSuperLuigiU'' {{DLC}} for ''Videogame/NewSuperMarioBrosU''.

An Arcade RailShooter adaptation of this game developed by Capcom, simply called ''Luigi's Mansion Arcade'', was released in 2015.
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!!This game includes examples of the following tropes:

* AbsentMindedProfessor: Gadd has even worse bouts of this than he did in the first game. In one scene, he can't even remember how many Toad assistants he has (made all the more serious by [[spoiler:the fact that King Boo is holding them hostage]]). It almost enters MadScientist territory, as E. Gadd is seemingly even more erratic and scatter-brained than usual while sending Luigi out to once again capture hundreds of spirits if not thousands in his name. Although he's so old that Gadd may simply be going senile, if he wasn't already.
* {{Adorkable}}: ''Luigi, Luigi, Luigi'', from his interactions with the Toads and the little victory dances he does.
* AdvancingBossOfDoom: [[spoiler:Between battle phases, King Boo]] will swell up and [[IndyEscape roll after you]], forcing you to run your way through an obstacle course to avoid getting hit.
* AffectionateParody: Enter the Underground Lab in Mission E-1 to see two Greenies re-enacting the beginning of ''Frankenstein''. If you finish the experiment for them, you find a hidden Boo.
* AllTheWorldsAreAStage: Treacherous Mansion, as some of its exhibition areas evoke the settings of the previous levels.
* AmazingTechnicolorBattlefield: King Boo is fought in King Boo's Illusion, an AcidTripDimension that has a swirling purplish/blue spiral on a blue landscape as a background.
* AmplifierArtifact: King Boo's new crown.
* AndIMustScream:
** Toads are trapped in paintings. [[spoiler:So is Mario.]]
** [[spoiler:This is what King Boo experienced while trapped in his portrait. [[BestServedCold He now wants to return the favor to Luigi, E. Gadd, and all of their friends.]]]]
* AnimatedArmor: Present in Gloomy Manor. They'll try to cleave you when you get close to them, and may block your path. In Treacherous Mansion, Greenies can possess them and use them to attack Luigi. [[spoiler:The Tough Possessor uses them as hosts, and ultimately possesses a huge one.]]
* {{Antepiece}}: A couple of mechanics appear to train the player for their use against bosses.
** Gloomy Manor's penultimate level focuses on burning the spiderwebs that have taken over the house, allowing you to practice with web balls and attached web sacs, which are used to clear out larger webs. These skills are necessary to force the Grouchy Possessor out of his spider host in the boss mission.
** The Tough Possessor haunts suits of armor, who must be knocked onto their backs by pulling rugs out from under them. The first mission of the Treacherous Mansion features a couple of Greenies with the same tactic and defeat strategy so you know what to do when you eventually face the boss.
** The Boos you capture throughout the game should have you well prepared for the Big Boo fight, which requires a similar approach.
* AntiFrustrationFeatures:
** Every mission ends by having E. Gadd call you once you've completed the last objective. However, he won't call until all the gold on the field is either collected or disappears, so you won't be stopped from collecting the drops from any ghosts you just captured.
** In Scarescraper, curses and traps are only active when there's more than one player to save others from them. In the event you're cursed or trapped and the only other people in the game disconnect, you'll automatically be freed to be spared from a Game Over or having to play the rest of the floor with inverted controls.
* ArsonMurderAndJaywalking:
** Gadd worries that the absence of the Dark Moon will make the ghosts go crazy, cause worldwide terror, and worst of all, ruin his research.
** Invoked once more in A-5's Description. "They're blocking our progress AND they ruin the furniture AND they're just plain gross!"
* ArtifactMook: The Carnivorous Plants show up in Treacherous Mansion for no real reason, including one that just happens to be sitting in a cupboard. Given that they're probably genetic experiments or something, you just have to wonder how they got all the way across Evershade Valley to a mansion in a middle of a ravine.
* ArtifactTitle: Luigi explores various different places, some less mansion-like than others, in this game, rather than a single mansion as mentioned in its predecessor's title. None of them are owned by Luigi to boot, and only two are even legit mansions. The titular Dark Moon, however, is your PlotCoupon, and thus is fairly important.
* AscendedExtra: Toads go from {{Save Point}}s to being an EscortMission, plus in said Escort Missions, they are useful for some of the puzzles.
* AttackOfTheFiftyFootWhatever: [[spoiler:The Tough Possessor's final host is a giant suit of armor.]]
* {{Autosave}}: The game saves when you complete a mission or [=ScareScraper=] game, unlike the original title and its manual save points.
* BadassInDistress: [[spoiler:Mario... again.]]
%% E. Gadd is not an example of BadBoss; a Bad Boss is someone who mistreats their henchmen on purpose.
* BagOfHolding: {{Lampshaded}} by E. Gadd after giving Luigi a particularly big key item, commenting that it's a good thing Luigi has such deep pockets.
* BagOfSpilling: The water, fire and ice medals that allowed the Poltergust 3000 to suck in elemental spirits and expel the substance they represented are not brought back, nor is the Boo radar of the Gameboy Horror, although the latter was built into that machine specifically and the Poltergust 5000 gets an upgrade that works equally well.
* BerserkButton: During the Three Sisters fight, if you try to stun a member of the trio who is looking into her mirror (instead of the one who lifts it away and becomes vulnerable), her sisters will attack you.
* BestServedCold: [[spoiler:The whole plot is King Boo's revenge plot against Luigi and friends. Note that this time the ''villains'' are putting the ''protagonists'' in paintings (he only mentions Luigi, Mario, the Toads, and Gadd as targets. Whether he has plans to do this to anyone else is uncertain.)]]
* BigBoosHaunt: In a sequel to ''Luigi's Mansion'', what do you expect? The first area, Gloomy Manor, is just a typical haunted house, but the others are a [[HailFirePeaks cross]] between this and other classic VideogameSettings.
* BigFancyHouse: Most of the mansions you visit are this. Given the setting, every single one is of course a HauntedHouse as well. Treacherous Mansion is ''especially'' big and fancy.
* BigThinShortTrio: The Three Sisters. Sister Herlinda is the big one, sister Belinda is the thin one and sister Lucinda is the short one.
* BlindedByTheLight:
** Luigi's flashlight -- which, in this game, is used like a [[http://en.wikipedia.org/wiki/Dazzler_%28weapon%29 dazzler]] in order to stun ghosts. Some ghosts are wearing sunglasses that must be vacuumed off before the light can be shined at them. Others carry objects or wear buckets and the like. For these, you have to either wait for them to attack before stunning them, or shine them with your Darklight Device, which will make them taunt and open them up to a strobe flash.
** Some small creatures that aren't ghosts (like spiders, mice, and bats) can be destroyed by the flashlight, which sometimes turns them into Hearts, coins, or bills. Golden versions of these creatures yield more valuable treasure when killed this way.
** On another note, here's a good safety tip for this game. A fully-lit room is usually safe. (Safe to a point; they might have something dangerous in it that isn't a ghost.) However, a dark room more than likely has ghosts hiding in it somewhere.
* BondVillainStupidity: There are a few background scenes that suggest that King Boo is capable of ambushing Luigi several times over the course of the game, suggesting that this whole thing is sadistic "fun" to him. (Much like it was last time.)
* BonusStage:
** Each mansion has one, which is unlocked by catching all the Boos in the missions prior to the boss. All of them involve clearing out ghosts from randomly chosen rooms.
** A few missions have these as well, where a door lets Luigi access a special area where a MiniGame is played under a time limit. Several of them require him to collect every Red Coin, another requires him to capture all the Gold Greenies in a giant hourglass that is filling with sand, and another requires him to win a snowball fight with three Hiders. All of them have a time limit. The only real tangible rewards are treasure (and in a few cases, Gems).
* BossInMookClothing:
** There's something like this in the D3 mission. At one point, Luigi has to defeat [[spoiler:a Super Greenie, a Super Slammer, and a Super Gobber]] to gain access to a door. [[spoiler:The Super Gobber is the one to watch out for. It has 300 HP (as opposed to most Super Gobbers, who have 200) and is harder to hurt. In fact, the only reason this isn't ''literally'' a BossInMookClothing is because the Vault does not distiguish it from other Super Gobbers]].
** Earlier in the game, [[spoiler:a Strong Sneaker acts as a miniboss that holds the last piece of a giant clock mechanism in Old Clockworks. Unlike a normal BossInMookClothing, this Strong Sneaker is weaker than the ones found later in the game (Barring D-2 and E-5), but it sits in the sidelines while it sends regular ghosts at the player once it's cornered (it does have one clever tactic; this is the EscortMission, and it can grab hold of Toad and use him like a shield, making itself impervious to Luigi's flashlight for a few seconds).]]
** The third Possessor forces you to fight lots of these as the boss fight.
* BossOnlyLevel: The boss missions qualify, with the exception of the Haunted Towers boss, which has a long staircase puzzle before the fight.
* BruiserWithASoftCenter: The Slammers are this when the Dark Moon isn't broken.
* CanonImmigrant: This game's multiplayer mode involves Luigi and three of his duplicates exploring a randomly generated dungeon together. The duplicates uses three of his alternate colors from ''VideoGame/SuperSmashBrosBrawl''.
* CerebusSyndrome: [[KnightOfCerebus With regard to the enemies]] -- the Boos at first are amusing and punny, but later on they actually become quite sinister by the fourth and fifth mansions. A key scene is [[spoiler:in D-2 in the crystal mine, where they are experimenting to make the other ghosts tougher and more vicious, and said other ghosts are visibly scared of them]]. King Boo is also far more evil in this game than he was in the first.
* CerebusRollercoaster: The music. The main theme is catchy and soft, while some of the rest of the soundtrack consists of ambient SFX tracks that wouldn't be out of place in a genuine horror title.
* ChargedAttack: The Poltergust 5000 can charge up Luigi's flashlight for a strobe like pulse with a greater range, meaning you don't have to spend quite as much time making more light tolerant ghosts, which is nearly all of them in this game, vulnerable, and it can stun multiple ghosts at once. The Poltergust 5000 will also build up meter the longer you attempt to suck in an object with it, allowing for a temporary extra strength pull. This allows it to shave off the fight points of struggling ghosts more quickly and is necessary when dealing with some ghosts which have unlimited fight points, so they'll never tire out and only get sucked in with out a forceful charge. Examples include Creepers, who are anchored to the ground with gooey pseudopods, and Possessors, who are weakened by pulling off layers of their skin, not by draining health. The charge is also necessary to get rid of force fields common enemies can generate, with the color of the field indicating the charge level that can remove it.
* ChekhovsGunman: The Polterpup first appears in the very first mansion playing with the first collectable gem of the mansion. From the second mansion onwards, you have to directly confront the aforementioned Polterpup in order to get the mansion's PlotDevice so that you can get to the Dark Moon piece.
* TheChessmaster: [[spoiler:King Boo.]] The opening of E-3 makes it plain that he knew the whole time you were spying on him and was spying right back at you, and then lures Luigi into the train exhibit to make him fight the Big Boo. This is on top of shattering the Dark Moon so that he would have an army of minions and would keep Luigi busy.
* ClockTower: The main sight of Old Clockworks is its huge clock tower. The boss fight agains the Overset Possessor takes place here.
* ClockworksArea: Old Clockworks, being an old clock factory, is filled with clock and moving gears Luigi has to cross.
* ColorCodedForYourConvenience: Each ghost type is a different color.
* ConsoleCameo: E. Gadd gives Luigi a modified first generation UsefulNotes/NintendoDS in the opening cutscene. (He later calls it the "Dual Scream".) It serves as the source of the maps of the mansions and as a means of communication between Luigi and E. Gadd, similar to the [[GameBoyColor Game Boy Horror]] from the first game.
* ContinuityNod:
** Looking at the promotional art, King Boo has a new crown. Hope it's more valuable than his last one, which was worth only one gold coin. [[spoiler:It's a powerful magic item, but to Luigi, it's worthless. He does take it at the end, but it does not increase his money at all.]]
** Luigi keeps the map he used to find the mansion in the last game on his mantel.
** Luigi actually ''lives'' in the rebuilt mansion from the first game. Apparently the Rank D mansion is the canonical one[[note]]not quite as bad as it sounds; the lowest was Rank H, which was a tent[[/note]].
** Luigi still "shows [that first boss ghost] who's boss!"
** E. Gadd mentions having carelessly given King Boo's portrait away at a garage sale to hand-wave his escape and presence in the game.
** [[spoiler:Boolossus (under the name "Big Boo" in the English version of the game) reappears as a boss, and is fought in a similar way to the original game.]]
** E. Gadd almost [[CallBack mentions the ghost portrificationizer]] until the parascope cuts him off. A part of it is used to contain the Boos you catch in the game.
** One of the Boos introduces itself as [=JamBoolaya=] and demands not to be called [=GumBoo=], the latter being the name of a Boo found in the original game.
** E. Gadd nostalgically reminisces about his and Luigi's last adventure early in the game.
** E. Gadd once again gives Luigi a communication/map device based on a Nintendo handheld, a DS this time.
** The Poltergust 3000 is upgraded straight to 5000 because a Poltergust 4000 [[VideoGame/MarioKartDS already exists]].
* CoOpMultiplayer: The [=ScareScraper=], which has up to four players trying to ascend through the building by either catching all of the ghosts, having everyone search for and stand on a set of switches in time, or chasing Polterpups depending which game mode is chosen.
* CosmeticAward: Getting all the Gems in a mansion gets you a statue in E. Gadd's Vault; it's kinda cool, but doesn't give you any real benefit.
* CowardlyLion: Luigi, of course.
* CreepyBasement:
** Gloomy Manor's Cellar is home to the mansion's Possessor and its host, the [[GiantSpider Spider Queen]].
** Old Clockworks has an underground ruin [[ShiftingSandLand with mummies!]]
* CreepyCemetery: Can't have a HauntedHouse-style game without one of these, right? There's one in the Haunted Towers. (Oddly enough, the only Mooks you have to worry are a few crows and a Golden Greenie, but this is where a Boo is found and a MiniBoss battle is fought.)
* CreepyDoll: The Rumpus Room in the Haunted Towers features one whose head follows you around the room as you walk around it. [[spoiler: Although its reason for moving is unexplained, the head is actually on a screw and can be fully detached if you run around it long enough. This gets you a gem.]]
* CutenessProximity: Nobody can really stay mad at the lick-happy ghost dog, despite the trouble it [[ObliviouslyEvil causes trying to play]]. [[spoiler:Luigi seems to have taken it in at the end of the game.]] The fact that the dog is the ghost which gives Luigi an extra life if he finds one of the Golden Bones kind of helps you like the little guy. It's the only ghost that Luigi never express fear towards, too...just exasperation.
* CutsceneIncompetence: Whenever Luigi prepares to do something and the scene changes to a cinematic, odds are things are going to go badly for him. Sometimes these cutscenes contain events that completely derail the mission and stretch out the mansion.
* CuttingOffTheBranches: The game makes the D Rank ending of the first game canon.
* DarkReprise: When [[spoiler:Luigi sees Mario stuck inside King Boo's painting]], a gloomy remix of the famous Ground Theme plays.
* DarkIsNotEvil: The Dark Moon is, despite the name, a RestrainingBolt on the ghosts. Rebuilding it is part of the game. Also, most of the ghosts in this game were actually pretty decent guys before King Boo came and started to cause trouble. In fact, after the battle with the Three Sisters, Professor Gadd remarks that they were very polite and courteous before all this happened, and remarks that he'd like to invite them to "ghost tea" once the situation resolves. [[spoiler:(And he does just that, during the end credits.)]]
* DeadpanSnarker: E. Gadd does this through the whole game, sometimes at Luigi's expense.
* DemonicPossession: Each of the main bosses except King Boo do this (which is natural, considering they all have the word "Possessor" in the names), possessing a creature or object to fight Luigi. Each BossBattle requires Luigi to force them out of their hosts somehow to use the Poltergust 5000 on them, and this must be done three times, in classic ''Mario'' boss style.
* DiscOneFinalBoss: [[spoiler:Big Boo and the Tough Possessor.]]
* DramaticIrony: King Boo is clearly the BigBad as shown right from the opening cutscene, but Luigi and E. Gadd don't find out until much later.
* DubNameChange: Outside of America, the Poltergeist bosses are known as Boffins, the [=ScareScraper=] is called Thrill Tower, and some of the levels have different names (such as the final boss, which is changed from "[[spoiler:A Nightmare To Remember]]" to the straight-up "[[spoiler:Shatter The Illusion]]"). Even some of the rooms have different names, despite mostly being straightforward. Can throw one off a bit when consulting a text-only walkthrough.
* EasterEgg: If Luigi stands under running water for a few seconds, he will [[ShowerScene take a shower]] and [[SingingInTheShower whistle]].
* EndlessGame: [=ScareScraper=] Mode, if you set the number of floors to infinite.
* EscapeArtist: The first two times Luigi captures the Polterpup, it escapes from the Poltergust 5000 before he can put it in the Vault. [[spoiler:Fortunately, Professor E. Gadd manages to make an improvement on the device after the second time, and it stays put after he catches it the third time.]]
* EscortMission: Luigi has to rescue Toads in several missions. They [[GameplayAllyImmortality can't be harmed]], so it's more a matter of navigating them past obstacles. If Toad is too scared to follow Luigi, and he often is (each one seems very afraid of something that is common in the mansion he's in), Luigi can carry him using the Poltergust 5000 and even [[EquippableAlly use him like a projectile]]. [[spoiler:In the rescue mission at the Treacherous Mansion (the hardest mansion), Luigi has to escort ''two'' Toads.]]
* EternalEngine: Old Clockworks, an abandoned clock factory overrun by sand.
* {{Expy}}: Some of the ghosts are rather similar to the first game's.
** Gold Greenies are like Speedy Spirits, being rare, fast, and hard to find, and netting the player lots of money when caught.
** Slammers are like Blue Twirlers, being the resident tough bruiser ghosts of the game.
** Gobbers are like Garbage Can Ghosts, being large BigEater enemies that leave hazards on the floor to make it harder to catch them.
** Creepers are similar to the Ceiling Surprise/Purple Bomber, as they can appear on any surface, have no HP, and operate by catching the player off-guard to hurt them.
* FeedItABomb:
** Downplayed with the defeat strategy for the monster plants-- you feed them prickly fruits (or, in one case, a ''flaming roast chicken''), which will cause them to expire.
** Once the defenses are broken, the Shrewd Possessor's icy host is destroyed in this way.
* FemalesAreMoreInnocent: After Luigi beats the Three Sisters (the only female ghosts in the game), E. Gadd says that he is kinda shocked to see them behave so violently, which he doesn't even bother to say about any other ghost in the game.
* FinalBossNewDimension: [[spoiler:Both the Tough Possessor and King Boo.]]
* FluffyDryCat: This happens to Fuzzballs when you use the Poltergust on them.
* FlunkyBoss:
** The boss of the Gloomy Manor has a swarm of spiders helping it and making it a tricky maneuver when pulling the webbing toward some fire to damage the boss. However, the spiders can be useful, because if hit with the flashlight, they might turn into Hearts.
** The third boss is a 12-wave endurance match against all the ghosts you've faced atop the clock tower, with the Possessor appearing after every fourth wave.
** Bosses in the [=ScareScraper=] ''always'' have normal ghosts assisting them. The reason for this is to keep the other players busy so that everyone can't just gang up on the boss.
* TheFourthWallWillNotProtectYou: An ''in-universe'' example. When you examine the security image before E-3, you see the identity of the final boss, only for him to turn round ''within the static image'' and laugh terrifyingly before making the shot fade to static.
* FreeSamplePlotCoupon: E. Gadd explains what the Dark Moon is and what happened to it, then reveals that he already found the first piece near the Bunker.
* FunWithAcronyms:
** The first letters of the five "mansions", the adjectives describing the Possessor bosses, and their unlockable ghost hunt missions spell G-H-O-S-T. And if you add in the [=ScareScraper=], it spells ghosts.
** In German, the first letters of the mansions and bosses spell out G-E-I-S-T.
* GameBreakingBug: The key glitch, where a necessary key fails to spawn in multiplayer and hence the run is unwinnable. No one knows what causes it.
* GameplayAllyImmortality: The Toad assistants cannot be hurt or killed during their {{Escort Mission}}s.
* GardeningVarietyWeapon: Some of the Greenies in the Haunted Towers use gardening tools such as [[ShovelStrike shovels]] as weapons.
* GetBackHereBoss: The fourth boss is constantly fleeing from you, with you giving pursuit in a bomb-launching sled.
* GiantFootOfStomping: [[spoiler:Excluding cinematics, all you see of the Tough Possessor's final suit of armor is two of these and a floor-piercing sword.]]
* GiantSpider: The Gloomy Manor Boss. ''Nasty''. Well, truthfully, the true boss is the Grouchy Possessor, who has [[DemonicPossession taken possession]] of the spider.
* GoingThroughTheMotions: Luigi has a few animations (most of them cowering in one way or another) while he's face-to-face with Gadd. Over the DS, he always has a "hmm mmm" expression even when Gadd is saying things that should be terrifying him and always lets out a big shudder when done with the call. Luigi always cowers with [[JerkAss Gadd laughing]] every time he's sent through the pixelator, which Gadd lampshades at one point.
* TheGoomba: Subverted with the Greenies. While they are the first ghosts fought and are the weakest of the ghosts, they are also the most creative and resourceful, as they begin to arm themselves with supplies in the area to attack with more power, and can use their weapons or armor (or sunglasses that must be pulled off) to protect themselves from your flashlight. Some even wrap themselves up as mummies!
* GreenThumb: Although there are a few monstrous plants to deal with, several plants are useful here, much like the first game. Using the Strobulb on flowers will usually yield treasure, and watering small shrubs can sometimes cause them to grow into beanstalks that Luigi can use to climb to rooms he couldn't previously access.
* HappilyAdopted: [[spoiler:At the end of the game, the red-collared Polterpup gets adopted by Luigi.]]
* HeelRealization: Some of the ghosts at the end, when the Dark Moon restores them to sanity. The Polterpup looks particularly ashamed of his repeatedly obstructive actions beforehand. [[spoiler: Luigi instantly forgives him.]]
* HoistByHisOwnPetard: [[spoiler:In order to defeat King Boo in the Final Battle, Luigi has to fool him into hurting himself. If Luigi takes advantage of his Boo shyness to position him right under one of the falling spiked balls he summons, King Boo is stunned for a couple of seconds, letting Luigi use the Poltergust 5000 on him.]]
* HollerButton:
** Pressing a direction on the D-pad will make Luigi call out for anyone in a mansion ("Hello?" "Yoo-Hoo?"). [[spoiler:Once Luigi discovers that Mario was kidnapped, Luigi's cries to the unknown will change to the cries for Mario from [[VideoGame/LuigisMansion the first game]].]]
** Multiplayer uses the same feature as its primary form of communication between remote players by incorporating phrases such as "Help help" and "Good job".
* IdleAnimation: Luigi has quite a few, including but not limited to adjusting the Poltergust 5000 and fiddling with his mustache. He even has a few idle animations specific to different environments-for example, in Old Clockworks, Luigi sometimes sneezes if you leave him alone long enough.
* ImpactSilhouette: The Polterpup leaves ghostly versions of these, only visible by darklight, to indicate which walls it's traveled through.
* ImprobableWeaponUser: The Greenies typically arm themselves with things like shovels and rolling pins, along with garbage can lids to use as shields. They'll pick up basically anything that could plausibly be used as a weapon in the area they're in (although they sometimes use actual weapons too, like swords and, in one area, spears).
* InterchangeableAntimatterKeys: A justified example; they ''disintegrate'' after you use them. Luigi quickly gets used to this tendency. In an old demo, the keys were eaten by the door instead.
* ItsPersonal: When King Boo finally meets with Luigi face to face, it's clear that this time, [[TranquilFury despite his composure]], that he's ''really'' pissed. This combines with some TermsOfEndangerment to create some really quite creepy dialogue.
--> ''Hey, if isn't my old pal Luigi. Or is it Baby Luigi? I can't tell the difference. Remember when you sealed me in a painting for all eternity? Good times.''
* JumpScare:
** While perhaps not so much to the player, Sneakers are the embodiment of this to Luigi, as their M.O. is sneaking up behind him and giving him a startle powerful enough to break his concentration and interrupt any ghost captures he may be attempting.
** Subverted in the intro sequence. A Greenie is shown approaching Professor E. Gadd from behind, but as it turns out, he doesn't actually want to scare him.
** In D-2, you find ghosts being strengthened by being encased in crystals. By the time you get up to them, they disappear, so you peek into one, and see nothing...until a Sneaker abruptly pops up inside before breaking out.
** Looking into the Workshop window in D-3 gives you a glimpse of the Shrewd Possessor trying to kill a Fuzzball, but the ghost notices you and disappears. Then it pops up right against the window.
** [[spoiler:In E-2, Luigi unlocks the door to Treacherous Mansion before turning around apprehensively, at which point King Boo appears in the doorway behind him and vanishes before being noticed. Later, in the intro to E-3, when you examine King Boo in the final security snapshot, [[TheFourthWallWillNotProtectYou he abruptly turns toward the camera and laughs.]]]]
* JungleJapes: Haunted Towers, as the house was built close to a large tree whose branches and leaves have overrun it and destroyed its middle section.
* KillItWithFire: The fire medal that let Luigi turn the Poltergust 3000 into a flamethrower doesn't show up in this game, but he can still make use of torches, logs, spider sacs, candles, and combustable fuel often, mostly in places where there are a lot of spider webs or ice.
* KillerRabbit: Most of the enemy ghosts. Creepers are described as having a fondness for cuddling, which they express by violently absorbing Luigi into their gelatinous bodies. Boos have pretty much always exemplified this trope, but they now ''squeak'' upon receiving damage and being sucked into the Poltergust, and take the form of little Boo Balls when defeated.
* KingMook: Besides [[BigBad King Boo]] ([[ExactlyWhatItSaysOnTheTin of course]]), the main game has the Ancient Poltergeist and the Tough Poltergeist. In the [=ScareScraper=], every fifth floor has one [[DualBoss or two]] of these, from five types based on the regular ghosts (save for Hiders). The last floor always has The Brain ([[RuleOfThree another Poltergeist boss]]). Each of the Scarescraper bosses add gimmicks; Bomb Brothers[[note]]Greenies[[/note]] carry huge bombs and drop smaller ones while being vacuumed, Beetle Whisperers[[note]]Slammers[[/note]] have regenerating shields and summon Beetles, Terrible Teleporters[[note]]Sneakers[[/note]] create portals to other rooms, Primordial Goos[[note]]Creepers[[/note]] and Creeper Launchers[[note]]Gobbers[[/note]] can create other Creepers (full-size and mini Creepers, respectively), and The Brain can free himself from the Poltergusts.
* KnightOfCerebus: King Boo is much more of a threat than he was in the last game, and is even scarier than before, rivaling even the RPG villains for the title of Most Evil ''Mario'' Villain.
* LampshadeHanging: Prof. Gadd provides this (naturally, since [[HeroicMime he's one of the only two talking characters]]), such as the way the same cutscene plays when Luigi pixelates to a level ('You don't have to cower in fear every time, you know. You've done this over a dozen times and nothing's gone wrong.'), the way they're stuck with each other in the same small bunker, and the way Luigi can carry big items around with him (see BagOfHolding).
* LastLousyPoint: One of the E. Gadd medals requires HundredPercentCompletion of the Vault (Gems, Boos, etc.) One of the stipulations is catching one of every type of Ghost, ''including'' all of the variants of the Scarescraper bosses. With 5 different bosses, and each having 9 different skins, this means you have '''45''' of them to catch, and the game randomly chooses from the lot every 5 floors. The game can sometimes be generous and provide you with a long streak of uncaught ghosts, but other times, you can expect to play it out for that last turtle-skinned Gobber for at least a few hours.
* LeaningOnTheFourthWall: Like in the first game, Luigi occasionally hums along to the background music.
* LighterAndSofter: To the first game, in many ways. While the original was a genuinely scary experience (by Nintendo standards), ''Dark Moon'' is much more comedic, has separate missions and more puzzle-solving elements than survival, and the aesthetic is much more stylized and quirky, with HollywoodDarkness in contrast to the true darkness of the first game.
* LongSongShortScene: The [[http://www.youtube.com/watch?v=H2mzKVQ2sBE music]] for when you pause during a mission is awfully long for a screen players will probably only spend less than 15 seconds on.
* LostInTranslation: [[spoiler:Big Boo is actually Boolossus from the first game. You can only know this if you're playing the Japanese version of the game due to the DubNameChange, however.]]
* ManEatingPlant: These appear frequently in the Haunted Towers, and there is just one in the Treacherous Mansion. They're completely unrelated to Piranha Plants, strangely.
* MeaningfulBackgroundEvent:
** King Boo can be seen flying in the background at several points in the game.
** At various points, you get to examine security footage of Boos carrying a mostly covered painting. A sharp observer can easily figure out what the painting contains.
* MediumAwareness: Luigi jumps at his own mission complete screen, although since it's serving as a Pixelator monitor, it may be justified.
* MetalSlime:
** The Gold Greenies only appear if you search in certain vases, drawers, etc., and once you find them, they run around you in circles. (Except for one area in the Secret Mine where there are two of them that attack Luigi.) They give out a ton of cash when you suck them in, so it is worth looking for them.
** A lesser version comes as gold-colored versions of minor enemies such as spiders and mice, which usually drop a gold bar or a wad of dollar bills if you use the flashlight on them quick enough.
* MindControlEyes: The ghosts have visible pupils when they're not corrupted.
* MineralMacGuffin: [[spoiler:Crystals from the Secret Mine are used to power up the ghosts.]]
* MoneySpider:
** If you finish off a ghost with a charged vacuum suction (by pressing A), you will get money for catching it. The higher the meter is charged, the more money you get. You also get more money for catching multiple ghosts simultaneously.
** The golden spiders (and bats, rats, crows, and so on) that roam the grounds and yield money when defeated.
* MultiMookMelee: In the final level before the boss in Treacherous Mansion, the timed ghost hunt culminates in [[spoiler:a fight with a horde of over 20 ghosts, who come in waves from the portal on the Terrace]].
* MuseumOfTheStrangeAndUnusual: Treacherous Mansion, though the exhibits aren't actually strange as much as haunted and possessed due to the place being a favorite haunting ground of ghosts.
* MusicalNod:
** The elevator music that briefly plays at the end of the [[http://www.youtube.com/watch?v=fyBxOw1gJUE&t=1m27s E3 2012 trailer]] is the [[http://www.youtube.com/watch?v=FTYsaFq4j_E pause menu music]] from ''[[VideoGame/SuperMarioStrikers Super Mario Strikers Charged]]'', which Next Level Games also made.
** The [[http://www.youtube.com/watch?v=5gfogbD7H6Y mansion intro]] theme seems to be a remix of the original VideoGame/LuigisMansion theme.
* MurphysBed: In the first mansion. When Luigi sits on the rather large bed in one of the rooms, it swings up against the wall that the headboard is adjacent to, tossing the poor guy into the next room. This is needed to progress in a couple of missions.
* MyBrainIsBig: Poltergeists. This is lampshaded by the name of the super Poltergeist in the [=ScareScraper=] mode, "The Brain".
* MythologyGag:
** The Toads make a squeaking sound whenever they walk, like in the Creator/DICEntertainment cartoons.
** The Fright Knight, a boss ghost from the [=ScareScraper=], has this as its description:
--> "Rumor has that this Greenie comes from the middle ages, where he was a knight searching for a kidnapped princess. Sadly, wherever he went, she [[VideoGame/SuperMarioBros1 always seemed to be in another castle]]."
* NiceJobBreakingItHero: Apparently, E. Gadd is partially responsible for this mess, having accidentally given away King Boo's portrait at a garage sale (kind of makes you wonder how secure all the ''other'' ghosts Luigi caught in the first game are...)
* NoNonsenseNemesis: [[spoiler:King Boo is made so much more menacing since he adopted this attitude. Justified since his revenge is what kickstarted the game's plot.]]
* NonstandardCharacterDesign: Boos are the only ghosts in the game to lack translucence and glowing effects, instead appearing as solid white ghosts like in other Mario games. This was not the case in the first game.
* NonstandardGameOver: If you blow up the bomb sled by taking too long against the Shrewd Possessor or run out of time during the penultimate Treacherous Mansion mission, it's an automatic game over.
* NoOSHACompliance: You'd be hard pressed to find ''any'' security feature in the Old Clockworks, which are filled to the brim with moving and dangerous gears. Luigi can even walk freely on the conveyor belts and gears.
* NumberedSequels: Outside America.
* ObliviouslyEvil: Unlike the other Evershade Valley ghosts, the loss of the Dark Moon hasn't made the Polterpup Luigi encounters throughout the story hostile. It's simply lonesome and wants someone to play with, but its antics still cause trouble for Luigi.
* ObstructiveBureaucrat: The Boo of mission E-3, [[PunnyName Booreaucrat]], acts like this towards Luigi, stating that the mansion is under the ownership of [[spoiler:King Boo]] and that he would be penalized due to not having an ID and mansion-roaming licenses on him. He attacks just like any other Boo in the game.
* ObviouslyEvil: King Boo, even more so than last time.
* OhCrap:
** Gadd has one when [[spoiler:King Boo abducts Luigi in the Pixelator]].
** Luigi gets his fair share over the course of the game too, but the best example is [[spoiler:when King Boo gets sucked into the vacuum, only to ''pull himself back out.'' '''Twice.''' Complete with what is probably the closest thing a Boo can do to a SlasherSmile. Luigi's fear is pretty justifiable at this point.]]
** Impressively, some of the ghosts start having this reaction to Luigi as he builds up a reputation in Evershade Valley. Instances include a Greenie in the B-3 mission, a Strong Sneaker in the C-5 mission, and five Greenies at once in the E-1 mission.
* OurGhostsAreDifferent: Obviously. E. Gadd implies that ghosts have the ability to evolve and adapt like living things, and many of the spirits native to Evershade Valley are unlike any he's ever encountered. Boos are apparently different enough to have their own container separate from all the other ghosts Luigi captures and sends to the Vault. Only three spirits are confirmed to have once been living humans (the Three Sisters), while the others are implied to be organic supernatural forces, which is a similar dichotomy between the portrait ghosts and the regular enemies from the first game.
* {{Overheating}}: The Poltergust 5000 can be modified to let Luigi's flashlight shine "dark-light", which reveals what ghosts have made invisible and makes solid what they have rendered intangible. The dark light feature only lasts a few seconds before it has to cool off, however. This will be upgraded for a longer limit with money.
* PaletteSwap:
** The sets of gems in each of the mansions are identical, but they have different colors for each area.
** All of the [=ScareScraper=] boss ghosts are large palette swaps of ghosts found in the single-player campaign, and each of the five types has eight of its own palette swaps in the form of themed skins.
* PassThePopcorn: Gadd claims he did this while watching the BossBattle of Haunted Towers. Fortunately, he takes the rest of them a little more seriously.
* PeekABogeyman: The Hiders embody this, lurking in various pieces of furniture and popping out with a laugh if Luigi tracks them down. Several other ghosts get in on the game, too.
* PhantomZonePicture: [[spoiler: Once again, Mario gets trapped into a painting. Unlike the first game, he is not able to move around in the portrait]].
* PinballGag: Capturing the Boos essentially boils down to this -- you use the Poltergust to pull on their tongues, then let go and watch them bounce all over the room.
* PlotInducedIllness: In the [=ScareScraper=] mode, there is a curse status effect that reverses your controls and can only be cured by using another player's Dark-Light. It comes complete with coughing from the player and is contagious, too.
* PortalNetwork:
** E. Gadd's Pixelator, which is used to link the five areas to his bunker.
** Later levels also have more traditional portals, but they only work in pairs. The final mansion has a central room with six teleporters connected to various parts of the mansion, though.
* PullingTheRugOut: This is how you defeat the Tough Possessor. It first divides itself to possess multiple regular suits of armor, which all must be lured onto one rug, which then must be pulled out with the Poltergust to force the Possessor to exit and regroup. (Some Greenies have a similar tactic and defeat in an earlier mission.) Then it possesses a gigantic suit of armor whose huge feet you need to lure onto separate carpets which must be pulled out in succession.
* PunnyName: Like last time, all the Boos have puns for names. Several of the levels do as well, such as A-5 (A Sticky Situation), C-5 (Piece At Last), and the final boss ([[spoiler:A Nightmare To Remember]], at least in America).
* RandomlyGeneratedLevel:
** All the floors in the multiplayer mode are randomly generated (including the types of enemies and boss ghosts found within).
** Intrusion Missions use the normal mansion layout, but the enemies appear in random rooms.
** The smaller cobwebs you need to suck up in "A Sticky Situation" are randomly generated each time you visit the level.
* RealityBreakingParadox: [[spoiler:In the "Paranormal Chaos" mission, King Boo creates a portal that summons a horde of ghosts, which threatens to create an effect like this unless Luigi can defeat the horde within a time limit (seeing as this is a TimedMission, it is implied that it happens if you fail to do so)]].
* RecurringRiff: The classic theme from the [[UsefulNotes/NintendoGameCube GameCube]] version returns in some scenes. Otherwise, the soundtrack is more varied this time around.
* RecursiveReality: At one point, you can find a dollhouse with windows you can look through. If you do so, you see the very room that contains the dollhouse, with Luigi looking through the window. A circular spotlight suggests that it is ''Luigi'' looking through the dollhouse window at ''himself'' looking through the dollhouse window.
* RidiculouslyCuteCritter
** The Toads, even more so than in other games. They're prone to hugging Luigi upon rescue and high-fiving him after solving a puzzle, make a squeaky noise like a soft toy when walking around, get scared easily and cry if they're separated from Luigi for too long, and yell "Wheeee!" if you send them flying with your vacuum.
** The Secret Mine has Fuzzballs, little fluffy monsters that are only interested in sleeping and playing with Luigi. While they can get stuck in your vacuum and be a nuisance, they frequently roll around to move, and their fur can adorably poof out if you blow on them with the Poltergust. One even smiles at you when the Possessor tormenting it notices you watching through the Workshop window and leaves it alone.
* RunningGag:
** Luigi falling in a different way almost every time he is transported by the Pixelator.
** Each Possessor scaring Luigi in a different way.
** Luigi celebrating after defeating each boss, only for something to appear and startle him.
* SeaSinkhole: The Treacherous Mansion somehow stands on a ''very'' precarious rock in the middle of one of these.
* SealedEvilInACan: Luigi did this to King Boo in the [[VideoGame/LuigisMansion first game]]... suffice it to say the can didn't last long. [[spoiler:And was apparently rather shoddy, since King Boo broke out ''by himself before he even found his new crown''.]]
* SeeTheInvisible: The Dark-Light Device attachment allows you to see illusions (items that ghosts have removed from the physical plane) and ghosts that are currently sneaking around invisible. This is required for some Greenies in the Old Clockworks, who will not come out of hiding until exposed with the dark-light.
* SceneryPorn: And proud.
* ShoutOut:
** The opening scene has nods to ''Film/{{Poltergeist}}'' and ''Film/{{Tron}}''.
** Luigi playing with the teleporters brings to mind the TV advertisement for ''Videogame/{{Portal 2}}''.
** The final story mission shares its name with a Music/DreamTheater song.
** One of the nicknames a player can get when you don't help out much in [=ScareScraper=] Mode is [[Franchise/TheHitchhikersGuideToTheGalaxy "Mostly Harmless".]]
** Continuing the previous Ghostbusters shout-outs, there is now a ghost containment machine.
* SiblingSenioritySquabble: Subverted with the Three Sisters in that ''the fact of who is older'' is the debate, as their bios state that Sister Herlinda and Belinda both claim the other is the eldest.
* SilentSnarker: Luigi shows signs of this during the few moments he's not scared out of his mind.
* {{Slapstick}}: When something goes wrong for poor Luigi, nine times out of ten, it's going to go wrong in the most humorous way possible. Luigi ends up on his butt or flat on his face at least once a mission. This also applies to the Boo defeat method- pulling back on their tongues to ricochet them around the rooms they appear in.
* SlippySlideyIceWorld: Secret Mine, located within a snowy region. The ice terrain makes the navigation more difficult, especially during the EscortMission as the Toad is afraid of thin ice.[[note]]And for good reason-your combined weight will break it, so he has to be launched across.[[/note]]
* SoProudOfYou:
** E. Gadd tearfully says this to Luigi right before the final battle, after spending the entire game making jokes at his expense.
** [[spoiler:Mario's compliments to Luigi after being saved from being a painting.]]
* SpeaksInBinary: One of the Boos, Combooter, says the word "Boo" like this.
* SpotTheThread: The Spirit Ball illusions work in this way, as they are objects turned invisible by ghosts. Noticing them requires either a good memory of the layout from earlier missions or an eye for missing pieces through suspicious asymmetry or conspicuous doormats and the like.
* StealthyMook: The Sneakers are ghosts who go behind Luigi while invisible in order to scare him while he's in the middle of sucking up other ghosts, only appearing visible during their scares or for very brief moments during their sneaking. The Dark-Light Device can reveal their location, but when capturing ghosts, this is not an option.
* StupidityIsTheOnlyOption: While capturing them isn't required, there are a couple of Greenies in the Treacherous Mansion that will only come out if you fall for their pranks. The first time, it is likely they will genuinely fool the player, but in replays, you still have to willingly lead Luigi into their tricks if you want to catch the ghosts.
* SuddenlyVoiced: This is the closest the series has gotten to full voice-acting since ''VideoGame/SuperMarioSunshine'' -- while the characters don't directly speak their lines, they have some clear English phrases. This is most noticeable in the ending, when [[spoiler:Mario congratulates Luigi]].
* SuperCellReception: [[ZigZaggingTrope Zig-zagged.]] The Dual Scream has pretty bad reception when Luigi goes underground, but it works perfectly fine when he's in an alternate dimension.
* SurpriseSlideStaircase: Those are encountered a few times during the game, most notably if you choose the wrong paths during the ascent of the Eerie Staircase in the Haunted Towers.
* SuspiciouslySimilarSubstitute: A few of the ghost types are expies of ghost types from the first game.
** Greenies are similar to the golden ghosts.
** Slammers are similar to the blue twirlers.
** Gold Greenies are similar to the speedy spirits.
* TakeOverTheWorld: [[spoiler:King Boo's ultimate goal, at least what he claims.]]
* TeleporterAccident: [[spoiler:King Boo intercepts Luigi and drags him to a different dimension while he's being pixelated back after the DiscOneFinalBoss.]]
* TelevisionPortal: How Luigi first gets to the Bunker.
* TemptingFate: Before starting one of the missions, E. Gadd jokes to Luigi that he doesn't have to cower in fear every time the Pixelator starts up, as he's used it a dozen times and nothing went wrong. After the battle with the [[spoiler:Tough Possessor, the Pixelator is hijacked by King Boo to beam Luigi to his own dimension. The resulting OhCrap from Gadd after he sees that Luigi ''didn't'' return carries a hint that Gadd thought it was ''his fault''.]]
* TermsOfEndangerment: King Boo has quite a few for Luigi, referring to him as his 'old buddy'.
* ThemeAndVariationsSoundtrack: The music that plays in each mansion is a variation of the same melody, arranged and orchestrated differently. Here's a few examples:
** [[http://www.youtube.com/watch?v=dW073cZERYI Gloomy Manor]] has a bass clarinet melody accompanied by piano and plucked strings.
** [[http://www.youtube.com/watch?v=CrPv3QIk3w0 Haunted Towers]] has a pan flute melody accompanied by low strings, marimba, and a tribal drumbeat to create a more adventurous atmosphere.
** [[http://www.youtube.com/watch?v=_odtsLngYHg Old Clockworks]] has a harpsichord melody and pipe organ harmony to create a more classical and refined atmosphere. [[http://www.youtube.com/watch?v=ZywFZarLh1M Clockwork Ruins]], on the other hand, is an Egyptian style remix, fitting for the environment.
** [[http://www.youtube.com/watch?v=KCO8nTXQB10 Secret Mine]] has the melody played on bells and a quiet electric bass harmony to create a mysterious atmosphere.
** [[http://www.youtube.com/watch?v=MLSIJEgjRrM&list=PLz5gUls4mkX8K_maB6fR-YJqqaCPtx44E&index=37 Treacherous Mansion]] has an ominous woodwinds and strings melody to evoke a lurking danger.
** Numerous Ghost Themes, [[http://www.youtube.com/watch?v=q65SQ7Rt2gw these]] [[http://www.youtube.com/watch?v=k9wi-kKZfS0 two]] for example, take on the main melody.
* ThemeNaming: The Boos once again are all puns with the word "Boo" in them. In addition, the "Possessor" ghosts that serve as the bosses each have an adjective one would often use to describe a college ''professor'', such as "Harsh Possessor", "Tough Possessor", "Grouchy Possessor", etc. In addition, putting the first letter of each of the Possessors' names spells out "GHOST".
* ThisIsGonnaSuck: Nicely summarizes Luigi's demeanor throughout the whole game. Also his reaction to [[spoiler:the fifty-foot living knight armor boss]].
* TimedMission:
** Every multiplayer floor and boss battle has a time limit. Run out and it's game over.
** So does the final non-boss level of the single-player game, "Paranormal Chaos."
* ToiletHumor:
** Gobbers, the obese yellow ghosts, run off this.
** The Polterpup urinates on a garden in Haunted Towers.
** The first time Luigi meets Polterpup in Haunted Tower, he apparently steps in dog doo it left behind, given the fact that he makes a rather unpleasant face while looking at his shoe.
** In Treacherous Mansion, Luigi will accidentally walk in on a Slammer on the toilet.
* TookALevelInBadass:
** [[spoiler:In the first game, [[BigBad King Boo]] couldn't battle you on his own; he needed the False Bowser suit. Here? He's [[ShockAndAwe firing lightning bolts]] all over the place, changing size to crush you, becoming intangible, ramming you, and executing divebombing tackles that cause steel spiked balls to rain from the sky. "Fight you like a true Boo", indeed.]]
** The Boos in general are much tougher than last time. In the first game, about half of them couldn't attack Luigi at all, and even the ones who could (other than Boolossus and King Boo) usually chose to run from him anyway. In ''this'' game, the Boos hide while invisible, and attack Luigi using dangerous ambushes from the shadows (having said that, once you get used to their MO, fighting them isn't ''too'' hard).
** On that note, Professor E. Gadd himself has taken a few levels. The upgraded Poltergust, that completely blows the last model out of the water? His doing. Replacing the fragile process of turning ghosts into portraits with ghost-sealing canisters? His idea. Creating means on the fly to repair and replace necessary items to get through the mansions that the ghosts periodically destroy? He's got that. Heck, a teleporter that only requires a monitor and security camera? Take a guess.
** In-game example: [[spoiler:Most versions of the Mooks have a stronger version that appears later in the game.]]
** In comparison to the first game's ghosts, Dark Moon's ghosts are much more crafty and resourceful in general, [[spoiler:even without being powered up]]. The Greenies in particular especially show it, equipping themselves with weaponry and defenses, disguising themselves, adapting to the situation (or to the enviroment) at hand, and just keeping their tactics and antics varied in order to take you down (or make things harder than they should be).
* TookALevelInJerkass: E. Gadd spends a disproportionate amount of time making backhanded comments about Luigi's fearful nature and skill as a ghost hunter. One time, he even compliments Luigi and says that he "may yet" become as famous as his brother... which he punctuates with a small chuckle, indicating that he was being sarcastic.
* TurnsRed: The Possessors become more difficult as you take away their defenses by pulling off their skins, which become progressively redder.
* UnexpectedGameplayChange: The Scornful/Shrewd Possessor boss has you man a bomb-launching sled to blow up its giant ice face first-person style. You use similar machines twice before in the game -- once earlier in the level to shoot burning charcoal, the other back in the second level as an optional way to get money and a Gem -- but it can still be jarring (especially since it requires more precision and you only have a limited amount of time before the sled overheats).
* UniqueEnemy: While they belong to a class of recurring minibosses, there is only one Ancient Poltergeist and Strong Poltergeist in the game.
* UnwinnableByMistake: The Thrill Tower[=/ScareScraper=] if a necessary key fails to spawn. There's also the story from [[http://nintendo3dsdaily.com/nintendoarticles/should-nintendo-release-a-patch-for-luigis-mansion-dark-moon/ this article's comments]] of someone who managed to quit between the [[spoiler:Tough Possessor and final battle]] and find themselves locked out of [[spoiler:the final boss and ending]] as a result.
* TheVeryDefinitelyFinalDungeon: Treacherous Mansion. It's a huge castle-like structure suspended on a tiny piece of land above a gigantic ravine/waterfall, which also happens to be a museum based on the earlier levels in the game. And it has things like a pirate ship sticking out the side and part of a tree sticking out the roof for no real reason.
* VileVillainSaccharineShow: [[spoiler:King Boo and his fellow Boos are a much more serious threat than before, in comparison to the berserk ghosts native to Evershade Valley who were just merely causing mischief. In fact, it is when Luigi discovered that King Boo is behind all of this that the story starts to become very serious.]]
* WeaksauceWeakness: [[spoiler:During part of the FinalBattle, King Boo has a weakness that Boos tend to have in Mario games: if Luigi looks at him directly in the face, he cannot attack Luigi or even move. This weakness is part of the strategy needed to defeat him.]]
* WeaponsThatSuck: Artwork of the Poltergust 5000 in action is the trope image.
* WhatCouldPossiblyGoWrong: E. Gadd says this as he's briefing you on the first mission of the clock tower area.
* WhatHappenedToTheMouse: [[spoiler:King Boo is not seen again after being sucked into the Poltergust 5000. He's not in the vault, there's no cutscene showing him being pumped out, he's not put in a painting... his crown's jewel also gets an unknown fate. Luigi picks it up and pockets it after the battle, but he's never seen taking it out, nor does it count for any money.]]
* WhenAllYouHaveIsAHammer: Much like the first game, Luigi uses only two weapons to fight monsters the entire game: A flashlight to stun ghosts (which is a lot more effective than the one in the first game) and the Poltergust 5000 (an upgraded version of the model he used in the first game; he does upgrade this several times during the course of this game, too).
* WolfpackBoss: The Three Sisters; technically a MiniBoss, but it's three individual enemies at once. There are a few other battles that could be considered MiniBoss fights which have more than one enemy, but in the other cases the ghosts involved become common enemies afterwards.
* ZergRush:
** The game likes to simply throw a large number of Greenies at you in a small room, which can cause you quite a bit of difficulty if they get on top of you. Doubly so if they're equipped.
** The Overset Possessor's fight turns into this near the end.
** This is the whole point of mission E-5, when a paranormal portal opens in the mansion, releasing a large number of ghosts. Luigi must quickly capture them before the dimension itself collapses, and the level culminates with an absurd amount of ghosts fighting Luigi at once.
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