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The second game in the ''[[VideoGame/MarioAndLuigi Mario & Luigi]]'' RPG series, released in 2005 for the NintendoDS. The Japanese name is ''Mario and Luigi RPG 2x2''.

The game changes a few game mechanics from the first one, and teams the brothers up with their time-travelling baby selves, who previously appeared in the ''VideoGame/YoshisIsland'' games as well as some of the sports game spinoffs. Princess Peach travels to the past and is [[DistressedDamsel promptly kidnapped]] when the Mushroom Kingdom of the past is invaded by the alien Shroobs. Our Heroes go into the past to find her and have to collect the [[PlotCoupon crystal shards]] that formed the Cobalt Star that was used to power the time machine in the first place while teaming up with their infant selves as well. Other than that, it's still pretty much the same game with some limited usage of the DS's features. The move-sets were altered to give each pair (bros and babies) unique items and moves, such as only the babies using hammers, and the Bros. moves in battle have been replaced by Bros. items instead.
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!!Tropes appearing in this game:
* AbsurdlyHighLevelCap: Level 100.
* AliensAreBastards: The Shroobs in general.
* AlienInvasion: By the Shroobs against the Mushroom Kingdom.
* AndIMustScream: The fate of some Toads early in the game. [[spoiler:Poor Toadiko and later Toadbert. Fortunately, they are revived at the end, but that doesn't make it any less scary.]]
* AngryFistShake: Luigi when Stuffwell lands on him after coming out of the first time hole. Also when Baby Mario snaps Luigi back to consciousness with a hammer whack to the head. This makes the babies cry [[BigBrotherInstinct causing Mario to get angry]] causing Luigi to then cry.
* BadassAdorable: Baby Mario and Baby Luigi of course!
* BadBoss: [[spoiler:Elder Princess Shroob frequently outright kills her henchmen during her (two, unless you count Shrowser) battles against the Mario Brothers...]]
* BalloonBelly: Baby Mario can get like this by guzzling from a water source.
* BanditMook: Dark Boos, who steal an item from the Bros should their attack connect. They flee the next turn after they steal an item.
* BigBad: Princess Shroob.
* BiggerBad: [[spoiler:Elder Princess Shroob.]]
* BigDamnHeroes: [[spoiler:Kylie Koopa disguises herself as a Shroob and ambushes the ones ambushing the heroes on the mothership.]]
* BigEater: Baby Mario and Baby Luigi sure love Yoshi Cookies! So much that they eat all of Baby Bowser's ill-gotten gains. [[BigNo He isn't amused.]]
* BossBonanza: The end features [[spoiler:a minigame fight with the Shroob Mothership, then normal boss fight with Princess Shroob, then her older sister, and then said sister's OneWingedAngel form. THEN there's a PostFinalBoss, Shrowser, after that.]]
* BuriedAlive: Petey Piranha does this to himself in his battle with him, although he only does it up to his oversized head.
* ButtMonkey: Luigi, as usual. In fact, he's very much an IronButtMonkey considering the number of misfortunes that befall him such as getting hit on the head at least ''fifteen'' times by Yoshi Eggs, a random enemy, [[RunningGag a gigantic Aurora Block that squashes him flat, Baby Mario's hammer...]]
* CatchPhrase: Stuffwell and his "BACK TO ADVENTURE!"
* ChekhovsGun: Subverted with [[spoiler:the giant Shroob key]].
* ChekhovsGunman: [[spoiler:Toadbert and his drawing.]]
* ClimaxBoss:
** The fight against Bowser and Baby Bowser, who kidnapped [[spoiler:the false]] Peach.
** Before them, the fight with Petey Piranha qualifies, as he ate Peach and Kylie.
* CognizantLimbs:
** The final boss has ''seven'' parts, though only three -- [[spoiler:Elder Princess Shroob's legs, crown and head]] -- actually need to be destroyed.
** [[CherryTapping You still do one damage]] if you still hit [[spoiler:the head, which is the main target,]] and avoid taking out anything else. Said Final Boss has 3000(US)/2000(Everywhere else) HP.
* CollectionSidequest: Finding the buried beans to trade for goodies at Fawful's Shop.
* CoolChair: [[spoiler:Princess Shroob uses one during her battle with the Mario Brothers.]]
* ContinuityNod:
** Prince Peasley from ''[[VideoGame/MarioAndLuigiSuperstarSaga Mario & Luigi: Superstar Saga]]'' appears on a poster at the Shroom Shop. And Fawful runs a shop.
** Also, when you meet Kamek, he mentions once trying to [[YoshisIsland kidnap the Baby Mario Bros., and that it didn't end too well.]] Also from when Baby Mario and Baby Luigi find the Yoshis during the trip to Yoshi's Island, they seem to be acquainted with each-other.
* DarkerAndEdgier: This game is much darker than [[VideoGame/MarioAndLuigiSuperstarSaga the first one]]. You've seen the AndIMustScream trope in the list, above, right? [[FromBadToWorse It gets worse]].
* DeadlyDodging: How you beat [[spoiler:Shrowser.]]
* DiscOneFinalDungeon: You go through the Shroob Mothership about ten hours into the game.
* DummiedOut: The "Scoot-Bloop" enemy, which would have originally appeared in the Vim Factory.
* EasilyThwartedAlienInvasion: An entire alien army is bested by four plumbers, and two of them were infants! Hell, [[spoiler:one of said infants' ''tears'' were all it takes to undo the damage they've done]] !
* EvilCounterpart: The Shroobs often act like this to the Toads, even having an enemy ingame known as the Shroobsworth. The Shroobs also have evil counterparts to other Mario characters, such as Princess Shroob to Princess Peach, Yoob to Yoshi, and the Shrooboids to Mario and Luigi (note that the elder one is red and the junior green).
* EvilDetectingBaby:
** When Princess Shroob arrives in the Mushroom Kingdom disguised as Princess Peach, Baby Peach is seemingly the only one to recognize her as she cries right in front of her.
** Also, Baby Luigi. He cries when he sees the spirit of the Cobalt Star [[spoiler:which is really the Elder Princess Shroob sealed inside]].
* ExoticEntree: When Baby Bowser is choking on stolen cookies, he is offered milk from Kamek, who insists it's from an evil cow. It's goes well with good cookies apparently.
* ExpositionFairy: Stuffwell the talking suitcase.
* TheFaceless: Princess Shroob's face is not actually seen up until the point you enter the Koopaseum. [[spoiler:Later, when she poses as Peach, a Shroob mushroom on her face is part of her disguise. With a wig, dress, and gloves, she looks exactly like Peach.]]
* FromNobodyToNightmare: Play any other game featuring Petey Piranha as a boss besides NewSuperMarioBros. He's a simple WarmUpBoss with little plot importance in each. In THIS game, however, he eats Peach and Kylie, is a ClimaxBoss, and is rather challenging in battle. (So, in a sense, the trope is inverted.)
* FissionMailed: You have to lose to the Shroobs in Hollijolli Village so that the Baby Mario Bros. can join you.
* {{Flanderization}}: Luigi's [[LovableCoward cowardice]] and [[ButtMonkey ineptitude]] are inflated to their limits in this game, to the point where [[ManChild he seems as childish as the babies.]]
** Toadsworth was also flanderized in this game: In his debut game, ''VideoGame/SuperMarioSunshine'', he was obviously worried about Peach, but remained somewhat level-headed about it. Come this game, he's paranoid to the point of believing his past self to be a criminal who turned Peach into a baby to kidnap her, and doesn't trust him too much even after he learns the truth. Though on the plus side, it does give him more of a personality than he had in ''Sunshine''.
* {{Foreshadowing}}: Plenty.
* FunnyBackgroundEvent: In Gritzy Desert, while Kylie Koopa is talking to Mario, Luigi is being chased by a Shroob and the babies are pursuing it with hammers. [[ButtMonkey Luigi also gets hit by the hammer and eventually collapses with a "Mamma mia!"]]
* GoingForTheBigScoop: Kylie's personal goal in the game is to write a book about the Shroob Invasion. [[spoiler:She succeeds.]]
* HopelessBossFight: Mario and Luigi against 3 Shroobs in Holijoli Village. You're given a time limit set for only THREE TURNS.
* IHatePastMe: Bowser ends up meeting his past self in Thwomp Volcano, and the two of them proceed to fight over which one gets to use the place as an evil lair. They eventually decide to team up, but neither one ever figures out the other's identity.
* IntrepidReporter: Kylie Koopa is always out for the next scoop.
* IronicNurseryTune: Hollijolli Village's background music is based around a depressing-sounding version of Jingle Bells.
* [[spoiler:KilledToUpholdTheMasquerade]]: Not exactly "killed", but the Shroobs have a ''frustratingly'' chronic habit of invoking this. Whenever a character tries to explain a single word about the Cobalt Star [[spoiler:and what it contains]], he or she '''will''' be [[AndIMustScream shroobified]] before getting to finish. The only exception is [[spoiler:[[DistressedDamsel Princess Peach]] herself, who instead gets interrupted ''constantly'' until [[SpannerInTheWorks Baby Bowser]] fully reassembles the star]].
* LargeHam: Bowser, as usual. Given a twist by his unintentional fall through a [[TimeyWimeyBall Time Hole]], where he meets his younger self, Baby Bowser (who can only be described as a ''Small'' Ham). [[spoiler:The two team up and battle the Bros. despite [[DramaticIrony both Bowser and Baby Bowser being unaware of who the other is.]]]]
* LastVillainStand: [[spoiler:The Elder]] Princess Shroob.
* MakeMyMonsterGrow: The Shroobs do this to Yoob. One can only wonder how the subsequent WombLevel properly functioned prior to the size change.
* MineralMacGuffin: The Cobalt Star shards.
* MoodWhiplash:
** The destroyed Toad Town section of the game is immediately followed by the celestial peace of Star Hill.
** When you first arrive in the past, the first area has a bouncy, lively rendition of the original Mario theme, but then you get to Hollijolli village, where you have a sad version of "Jingle Bells".
* MyFutureSelfAndMe: The gameplay hook for this game has the adult and infant Mario Bros. teaming up inside and outside battle. Having both generations of Bros. together in battle lets you use attacks and Bros. Items in new ways, such as double jumps and fireballs that can target air enemies.
* NiceJobBreakingItHero: [[spoiler:Assembling the Cobalt Star, which takes 95% of the game, undoes everything Peach sought to avoid from the start of the game and unleashes the Elder Princess Shroob.]]
* NiceJobFixingItVillain: [[spoiler:Princess Shroob's plan to take over the modern day Mushroom Kingdom while disguised as Peach would have probably been much more successful had Bowser not shown up and attempted to kidnap her, hurling them both back into the past in the ensuing chaos.]]
* NonstandardGameOver: the only GameOver that can happen outside of battle. [[spoiler:When you get to use the Shroob flying saucer, [[UnexpectedGameplayChange its controls need the plumbers to hit four blocks by jumping]].]] If you fail, the [[spoiler:flying saucer]] falls as [[NothingIsScarier the screen fades to black]] and the plumbers freak out, while you get mocked by Princess Shroob's creepy laughter.
* NoodleIncident: Used by the gate to the Star Shrine when it talks to Luigi.
* OcularGushers: Baby Luigi, Baby Mario, Baby Peach, and Luigi all do this frequently.
* OneWingedAngel: [[spoiler:the Elder Princess Shroob]].
* OrcusOnHisThrone: [[spoiler:Princess Shroob attacks the brothers directly after they anger her enough by destroying her mothership.]]
* PerpetualFrowner: Peach, for some reason. [[DarkerAndEdgier Given the scenario, however...]]
** She ''does'' look perfectly happy in her official artwork, though.
* PointOfNoReturn: Used and subverted: The fight against [[spoiler:the Shroob Mothership]] is the point of no return, but Stuffwell warns you about it. Even better, after you pass the PONR, he gives you the possibility to go back to before the fight, asking you every time you hit a save point.
* PortalToThePast: They conveniently start appearing all over Peach's Castle after E. Gadd's TimeMachine returns useless.
* PostFinalBoss: [[spoiler:When Mario, Luigi, and the babies return to the present after defeating the Elder Shroob Princess, what's left of her possesses Bowser (turning him into "Shrowser") for one last battle.]]
* PressXToNotDie: [[spoiler:All you can do in the final fight against Shrowser is dodge/deflect his attacks long enough for him to [[TacticalSuicideBoss whittle down his own health bar.]]]]
* PunctuatedForEmphasis: Fawful. I WILL! HAVE! FURY!
* PunnyName:
** Prof. E. Gadd. Egad. [[DontExplainTheJoke Geddit?]]
** Sunnycide, as well.
* SadBattleMusic: The FinalBoss music.
* [[SchrodingersCat Scrödinger's Plumber]]: The Copy Flower makes practically an infinite number of clones of the bros. The one that messes up is the real one, so theoretically all of the Bros. that attack are Real and Fake at the same time (until you mess up, anyways)
* SealedEvilInACan: The [[spoiler:Cobalt Star]] holds [[spoiler:Elder Princess Shroob]].
* SealedEvilInASixPack: The protagonists spend the game collecting several shards of the Cobalt Star. Only when they collect and put the pieces together do they realize that the star [[spoiler:actually contained the leader of the invading aliens who was trapped inside by Princess Peach, and that by putting the star together, they release her.]]
* SequelDifficultyDrop
* SesquipedalianLoquaciousness: Stuffwell is rather fond of this.
* ShoutOut: The Snoozorb's appearance and sleepy motif brings to mind an infamous Metroid boss.
** There are various references, such as the opening, the mothership crash and Princess Shroob's chair, that pretty much make the game a Mushroom Kingdom [[http://tvtropes.org/pmwiki/pmwiki.php/Literature/TheWarOfTheWorlds War of the Worlds]].
* SoleEntertainmentOption: The arcade housed in a freakin' ''VOLCANO''.
* SoundtrackDissonance: The [[http://www.youtube.com/watch?v=ujQwJdykk68 ending credits theme]], which sounds downright ''sinister'' compared to what you'd expect from an ending theme in a video game.
* SpannerInTheWorks:
** [[spoiler:Like in [[MarioAndLuigiSuperstarSaga the prequel]], Bowser causes everyone a headache by choosing to kidnap Princess Peach at the worst possible moment. This time it turns out to be a ''good'' thing however, as "Princess Peach" was actually a disguised ''[[BigBad Princess Shroob]]''.]]
** [[spoiler:Baby Bowser plays this trope in a much worse fashion, suddenly appearing in Shroob Castle to assemble the Cobalt Star after the Bros. were told not to. Cue FinalBoss.]]
* SpeakingSimlish: Everyone. The Bros' version sounds vaguely Italian, with a few recognizable words; the Shroobs are entirely tonal.
* SuckingInLines: Serves as a tell for the Snoozorb enemy. If the lines are spinning, the laser they shoot will go overhead, meaning that you shouldn't jump.
* SugarApocalypse: What happens to Toad Town and Hollijolli Village. The latter is probably more unsettling, as it happens right as Mario and Luigi are watching, and right during Christmas.
* TakeThat: The {{Brainwashed}} Hammer Bros. speak entirely in 1337-speak in the English release. After they're freed from the mind control, one of them remarks "Seriously, who talks like that?"
* ThatLiarLies: The Star Gate accuses [[spoiler: Luigi of this when Luigi was only given three options instead of 4: Everyone! The Star Gate is the true liar but it's all part of a test.]]
* TheAllSolvingHammer: Baby Mario constantly attempts to solve things by hitting them with his hammer.
* TimeTravel: The plot is half this and half AlienInvasion.
* TimeyWimeyBall: It's probably best not to analyze this at all, as the time travel doesn't even try to make sense. There's a great timey-wimey scene that combines MeanwhileInTheFuture with RippleEffectProofMemory -- The Bros give younger Professor E. Gadd a EurekaMoment, and we cut to older Professor Gadd, who is ''having the idea at the same time, and is aware that it's because his memory is changing''.
** A less apparent example occurs with [[spoiler: Princess Shroob disguising herself as Peach to take over the Mushroom Kingdom of the present. It is quite clear that the Mario Bros. and their baby counterparts are the only people in the Kingdom capable of fighting off the Shroob invasion, so every time they return to the present before the Shroobs are defeated, they are leaving the past Kingdom completely vulnerable to Shroob takeover. Princess Shroob shouldn't ''need'' to go to the present because the present Peach's Castle should be Shroob Castle without anyone to fight against it over the timeskip.]]
* UndergroundMonkey: Many enemies are merely Shroob versions of standard Mario enemies. One good example is the Tanoomba, which gets a Shroob variant in the final dungeon.
* VileVillainSaccharineShow: The Shroobs. Murderous psychopaths who attack innocent civilians, try to use Toad souls/life force for UFO fuel and turn the entire world into {{Mordor}}. And they attack Hollijolli Village right on Christmas Eve. And additionally seem quite fine with brutally trying to murder the baby forms of Mario and Luigi (and any other characters). They're why this is seen as one of the darkest games in the franchise.
* VillainousBreakdown: Given what a short temper Princess Shroob has, it's not surprising that she eventually goes berserk following the destruction of her Shroob mothership...
* WarmUpBoss: Baby Bowser (for Baby Mario) and Junior Shrooboid (for Mario). [[ZeroEffortBoss Naturally, you can't lose either of them.]]
* WeaksauceWeakness: How to dispose of evil toxic fungal life-sucking alien Bio-Weapons? [[spoiler:Cry on them.]]
* WhatHappenedToTheMouse: ''Tons''. [[spoiler:The captured toads, though revived at the end, are never directly rescued, Yoob is literally left hanging, Junior Shrooboid just vanishes, Toadiko and Toadbert are never seen returning to the present, and the remaining Shroob forces are not accounted for.]] The last two, however, are addressed in the sequel. [[spoiler:Toadbert at least made it back, and the Koopa-Troop slaughtered the Shroob army and froze the survivors.]]
* WhereItAllBegan: The endgame takes place in Shroob Castle, which is the Shroobified version of Peach's Castle, the first area you explore. [[spoiler:The PostFinalBoss fight with Shrowser also takes place in Peach's throne room, where you first fought Baby Bowser and Junior Shrooboid at the very beginning.]]
* {{Wingdinglish}}: How the Shroob language is presented.
* WombLevel: Yoob's stomach.
* WouldHurtAChild: None of the bosses which are obviously sapient show any hesitation in attacking Mario and Luigi while they are ''carrying their baby selves on their backs''. Not to mention that [[TimeParadox killing their baby selves would affect other characters more than just emotionally.]]
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