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* EightPointEight: [[http://asia.gamespot.com/luigis-mansion-dark-moon/reviews/luigis-mansion-dark-moon-review-6405758/ GameSpot]] gave the game a score of 6.5. The Metacritic average is 86. The Gamespot review itself was also really strange. It mostly consists of glowing praise, only complaining about the check-pointing and one particularly frustrating sequence. Apparently it was frustrating enough to be worth 3.5 points.
* AnnoyingVideoGameHelper: Gadd constantly calling you to critique your work is probably the only weak point of this game. It gets annoying at times and he does it so frequently that it really slows down the pacing of the game, making him an almost unbearable chatterbox for even first-time players.
* AntiClimaxBoss:
** The boss of Haunted Towers. [[spoiler:You solve a long staircase puzzle to be faced with a giant staircase]] that is quite a bit easier than the first boss.
** The Tough Possessor, the boss of the Treacherous Mansion, isn't exactly a pushover, but he's easier than Big Boo and the E-5 mission, both of which come before him. Considering the [[ThatOneBoss previous]] [[ThatOneLevel missions]] that came before it, not to mention it was [[PostFinalBoss before the Final Boss]], [[BreatherBoss maybe it's a good thing that the Tough Possessor is easier]].
** The Brain, the final boss of the Scarescraper. Like all the other bosses, he's a KingMook with a special gimmick; in this case, Poltergeists. The Brain's gimmick is being able to charge up and release a sphere of energy to free himself from vacuums. However, Poltergeists already have the ability to attack while being sucked up, the charging can be interrupted by a power surge, and the energy sphere does no damage, giving no incentive to simply break the charge. In the end, he ends up being the second weakest of the four Poltergeist types.
* AuthorsSavingThrow: For E. Gadd, since in the original game he states he was turning ghosts into portraits for his art collection, which makes him come off as a DesignatedHero since not only is there not any moral reason for it, but many of the ghosts he went after weren't even violent unless provoked. In this game, most of the ghosts are friendly until the Dark Moon is shattered, and after it's reassembled and the ghosts go back to normal, he releases all of them.
* AwesomeMusic: [[http://www.youtube.com/playlist?list=PLz5gUls4mkX8K_maB6fR-YJqqaCPtx44E Oh, yes. Definitely.]]
* BestBossEver: The very first boss: Grouchy Possessor (aka the one who possessed the spider queen), as well as the FinalBoss King Boo. While Grouchy Possessor has the same weakness (lighting the web ball that hangs from the spider's web) that forces it out of its host, it changes the way you attack that weakness every time you damage it, while King Boo [[spoiler:alternates between fighting you for real, and forcing you to run through an obstacle-filled course with him right behind you]].
* BrokenBase:
** Despite its overall better reception than its predecessor, the two major divisive elements are the Mission-based gameplay and the game being split up into 5 mansions. Both are understandable given the platform and the need for more variety, but it's a shift away from the original style, [[TheyChangedItNowItSucks and that's all people need to complain]].
** As pointed out by LetsPlay/{{Chuggaaconroy}}, the boss fight against the Shrewd Possessor in the Secret Mine is this. Some people enjoy the boss fight because of [[UnexpectedGameplayChange its uniqueness]] and the scale of the fight. Others find it to be a frustrating and overly difficult ThatOneBoss (detailed under ThatOneBoss below).
* CompleteMonster: [[BigBad King Boo]] sheds any [[WellIntentionedExtremist redeeming qualities]] from the [[VideoGame/LuigisMansion previous game]] and becomes an [[TheUnfettered unfettered monster]]. After his first defeat by Luigi, King Boo [[ItsPersonal is consumed by his lust]] for [[{{Revenge}} revenge]] against Luigi, and shatters the Dark Moon, [[BrainwashedAndCrazy enslaving the minds of the once-docile ghosts of Evershade Valley to his control]]. Unleashing them on the valley, King Boo abducts [[spoiler:Mario himself and]] several Toads [[AndIMustScream and imprisons them within paintings]]. Uncaring about his minions, King Boo [[spoiler:performs experiments on his ghosts against their will]] to amplify their destructive potential, and calmly allows his own Boos to be caught and sealed by Luigi in a stark contrast to his [[AFatherToHisMen characterization in the last game]]. After Luigi gets close to restoring the Dark Moon, [[VillainousBreakdown King Boo starts to lose it]], and [[spoiler:tears open a portal to the ghosts' homeworld with the intent to destroy the universe]] as an act of spite. Once he's foiled, King Boo [[spoiler:warps Luigi to his own dimension]], announcing his intent to trap Luigi and all his friends in paintings as he [[TakeOverTheWorld conquers the world]] and "paints the town red." [[KnightOfCerebus Shockingly dark]] for a [[Franchise/SuperMarioBros series]] that is usually [[VileVillainSaccharineShow lighthearted]], King Boo devolved into an [[TheSociopath uncaring sociopath]] who would willingly [[OmnicidalManiac kill everyone]] and [[TheEndOfTheWorldAsWeKnowIt destroy everything]] just for a chance to get back at his rival.
* CreepyCute: The unpossessed spider queen is actually kinda cute. Still a little unsettling due to being a spider, but cute.
** The Boos (besides King Boo, of course) are rather adorable as well, with their [[PunnyName pun-tastic names]] and signature high-pitched cackles. Not to mention that little *squeak* they make when you vaccum them up.
* DemonicSpiders: While Gobbers are usually minor nuisances, they become this in Scarescraper's Rush Mode. There, they appear in certain rooms where whenever you try to use a predetermined door, one will show up and cause goop to appear on the door, with the only way to unlock the door being defeating it. Goobers have at least 100 HP at all times, and in Rush Mode, the time limit is so strict that you might run out of time. Even in groups, they're more likely split up in order to look for the goal, and by the time they regroup, time's up.
* EarWorm: Just like the first game, this game's main tune will get stuck in your head and never leave. On top of that, there is [[http://youtu.be/C6UPn5QGypQ Sticky Situation]] and [[http://youtu.be/hHpecqQrT1k Library Piano]].
* EvenBetterSequel: The first game is fairly beloved, if often criticized for its short length. By contrast, the sequel has enjoyed almost universal praise.
* FunnyAneurysmMoment: In one of the missions for the third Mansion Dr. Gadd tells Luigi to stop trembling in fear whenever he uses the teleporter, saying that they've "done this a dozen times" and there's nothing to worry about. [[spoiler:Of course, he's proven wrong at the end when King Boo is able to sabotage it.]]
* GoddamnedBats:
** The little orbs that float around creating illusions. They have a tendency to scatter when they're revealed, will move around if they're not vacuumed up quick enough, and can hurt you if they pass through you. And if even one goes back into hiding, you have to do the whole process of revealing the hidden object and vacuuming them all up again.
** The actual bats, along with spiders, mice, and beetles are perfect at harming and distracting you while you're busy sucking up the more dangerous ghosts.
* GoddamnedBoss: The Terrible Teleporters in the Scarescraper. A DualBoss based off the Sneakers, their gimmick is spawning little funnels. These funnels will teleport you to another room, forcing you to walk all the way back each time. You'll only lose a few seconds generally, but it's still annoying
* GeniusBonus: 'I'm [=ParaBoola=]! I've set my derivative to zero to be at my peak! [[GivingUpOnLogic I mean... BOO!]]'
** Don't forget about ''Boo''lean.
* HellIsThatNoise:
** An eerie, low hum plays when there's an invisible Boo flying about.
** The music that plays in the [[http://youtu.be/X11LUBv5d90 Garage]] and [[http://youtu.be/XcEsE-2NWlA Haunted Graveyard]] certainly qualify.
** [[http://www.youtube.com/watch?v=VmdyeXnJe6A Distant Piano]], which is odd because the actual Library Piano it's supposed to be a distant version of is [[EarWorm rather catchy]] and not that scary.
** Luigi has an in-universe case when the first mummy appears in C-2.
* JerkassWoobie: As cruel as the Boos are in this game, the helpless squeaks they make as Luigi crams them through the Poltergeist's nozzle do manage to make you feel bad for them, if only a little.
* MoralEventHorizon: King Boo crosses the line [[spoiler: when he destroys the Dark Moon, knowing that he'll force every ghost in Evershade Valley under his control, then creating a portal to unleash an army of ghosts to tear apart the fabric of the universe, and finally by putting Luigi through a horrific experience before they fight and gloating that Luigi, Gadd, and all of their friends are going to suffer the fate Mario did, which he's shown to be perfectly capable of doing.]]
* TearJerker: King Boo losing any and all of his previous AFatherToHisMen-ness due to his sheer RevengeBeforeReason here.
* ThatOneBoss:
** The [[GiantSpider Spider boss]][=/=]Grouchy Possessor from the first mansion due to being a brutal WakeUpCallBoss. Doubles at BestBossEver for some.
** E-4's Big Boo boss if you're trying to get a 3-star rank on it, as you have to finish it within 3:20 without taking damage (or within 1:20 if you get hit exactly once). This can be an exercise in frustration as it means you have to trap a lot of Boos every time you manage to split up the Big Boo ''and'' avoid the other Boos' attacks while you're trying to aim a Boo at a cage. About the best thing you can do to ensure that you'll have an easier time is to try to catch as many Boos at once with your Darklight before you aim for the train.
** Among the Scarescraper bosses, the Primordial Goo type bosses. Based on Creepers, they behave almost exactly the same, with the major difference that whenever a power surge is used, the Goo will fire a regular sized Creeper right at the Luigi who used it, and if he doesn't move out of the way, the Creeper will trap the Luigi, dealing a good amount of damage, and free the Goo, wasting time.
** The Ice Monster controlled by the Shrewd Possessor in the D mansion which happens to be the shortest one in the entire game. You have to master using the [[ScrappyMechanic 3DS' Gyroscope]] and overall terrible circle pad aiming to destroy pieces of the boss' armor using finicky cannonballs. If you screw up 6-7 times in a row his armor will re-freeze so you have to do it all again. To top it off it is possible to overheat your cannon resulting in a [[OneHitKill instakill]]. And guess what? You have to do it all over again. That's not even getting into attempting to [[ThatOneAchievement 3 star it]].
** The [[MarathonBoss Overset]] [[LevelInBossClothing Possessor]]. For starters, he's most likely the biggest CombatPragmatist among his brethren: His possession choice? The entire arena itself, leaving you without a specific target altogether most of the time. His main attack method? ZergRush waves of prior enemies -- including some DemonicSpiders, no less -- that even repeat if undefeated within their respective time limits. The rare event of him actually coming out to fight directly? His Paranormal Shield even [=100%-=]{{No Sell}}s the Poltergust, forcing you wait for an opening first. Oh, and the kicker? Those wide-reaching clock hands can damage you as well -- and that does include whenever you get dragged into them, which can also happen quite easily.
* ThatOneLevel:
** E-5. The level is simply running from room to room, catching the ghosts. However, you're on a time limit, and there are tons of ghosts. And once you beat them all, one final wave appears. This one is massive and contains dozens of ghosts who can easily gang up on you. Hope you practiced capturing multiple ghosts at once, because taking them on one at a time is an easy way to get yourself beaten up. Oh, and this is the one level in this mansion where you have to go out of your way for the Boo, meaning if you don't get it, you have to do the level all over again. There's a video [[http://www.youtube.com/watch?v=YZRAAGOa5qM here]] that shows one way to do it. (He does show you how to get the Boo ''first'', which is definitely a good idea.)
** E-4 if you're trying to get a 3-star rank on it, which in this case requires you to beat it within 3:20 without taking damage (or alternatively, within 1:20 if you get hit exactly once).
** Rush Mode in general if you don't know how to find time pieces. The worst part is that everyone has to reach the end room, so it only takes one person who doesn't know what they are doing to screw it up for the entire team.
** B-6. Those stairs are the absolute worst and you know it.
* TheyWastedAPerfectlyGoodCharacter: After beating the Spider Queen/Grouchy Possessor, E. Gadd makes a big deal out of the fact that possessor-types can possess and control living beings...which is never used again considering the following bosses are: A staircase, a clock, ice itself and suits of armor.
* UnwinnableByInsanity: You can lock yourself out of Treacherous Mansion if you play around with ghosts, teleporters and objects in the Nautical Exhibit. But you have to be really, really trying to pull this one off.
* WhatAnIdiot: Gadd. While he's clearly not there mentally throughout the game, the fact that he sold the King Boo painting at a garage sale really shows it. True, the Professor was led to assume that King Boo would need to be sent back through the Portraitficationizer, like Mario was, to be restored (little did Gadd- and we- know that Spirit Balls were kind of a thing King Boo could use), but being so careless with something so dangerous is still pretty bone-headed of him.
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