Mario & Luigi: Dream Team

This is the fourth game for the Mario & Luigi series and also the first amongst them to be released on the Nintendo 3DS.

Invited to a luxurious island resort, Mario and company board a blimp to Pi'illo Island; however the cruise takes a dark turn after a mysterious pillow appears and a malevolent spirit picks a fight with Mario. After an emergency landing, the promotional tour largely proceeds as planned until Peach and Toadsworth discovered an ancient, pillow-shaped relic in the depths of Pi'illo Castle. As the protagonists inspect the artifact after Luigi decided to take a nap on it, Princess Peach is pulled into the Dream World and Mario dives in after her to rescue her.

Tropes used in Mario & Luigi: Dream Team include:

Advancing Boss of Doom: Most of the regular bosses in this game have an attack where they chase the heroes into the foreground and continually attack them until they tire themselves out or they run into something.
Berserk Button: Kill any of Big Massif's Hooraws, he not only gets angry, his attack power actually gets an temporary boost. And killing off enough of them can turn into an One Hit KO on account of how pissed he is.
Broken Bridge:
- The obligatory literal example is the Mario Bros. trying to cross a rickety bridge south of Pi'illo Castle to reach Mushrise Park; the bridge gives out, and the heroes are forced into travelling south to continue the plot after they escape the abyss.
- And the various exits that are leading out of Mushrise Park are obstructed with debris caused from a violent storm. The only road that's open is the one leading to Dozing Sands.
Flunky Boss:
- Big Massif and three of his apprentices have a small army of Hooraws that participate in certain attacks and to serve as a buffer for the standard hammer attack.
- The Elite Trio has an endless numbers of Goombas at their disposal.
Follow the Money: In the Dream World, it isn't an unusual sight to see a string of coins aiding you in making a difficult jump.
Glass Cannon: Statistically speaking, Thunder Sass fills this role out of the four Hooraws by having the lowest health and defense amongst them; this is justified by his battle having a "counterattacks only" challenge.
I Shall Taunt You: In a rarity for the series, Pi'illodium is capable of rubbing salt into the wound by bragging about how powerful he is when he's airborne.
Keystone Army: Defeating every Dreamcap Captain on the battlefield will cause the remaining Dreamcaps to huddle in fear and eventually retreat instead of attacking.
Lethal Lava Land: Even when he gets a new castle, Bowser still wants it filled with lava, even though he's vulnerable to it in the Dream World.
Lightning Bruiser: Out of all the named Hooraws, Thunder Sass moves the fastest and hits the hardest when it comes to attacking.
Lost Woods: Somnom Woods is a dense forest that hasn't been touched by Pi'illo Island's tourism industry. Consequently, hardly anyone is aware of the ancient ruins located in the deepest part of the forest.
Me's a Crowd:
- In the Dream World, Luigi can generate a seemingly infinite number of copies of himself called "Luiginoids." In combat, they pitch in by turning Mario's attacks into crowd-clearing shockwaves and landing on nearby enemies after he jumps.
- Sergeant Guy has an attack where he transforms dozens of Goombas into illusions of him and uses them to sneak in a few hits on Mario.
- Kamek resorts to this during the second and third battles against him, the difference being that the clones in the third battle actually fight back.
Palette Swap: Enemies with an red "R" to their name are a stronger version of the coresponding species, and most of these are a recolor of the "original" ones.
Pint-Sized Powerhouse: Thunder Sass, the shortest one out of Big Massif's apprentices, manages to be the one who hits the hardest.
Rank Up: While their actual ranks are still the same as they were in the last game, Private Goomp, Corporal Paraplonk, and Sergeant Guy were promoted to being one of Bowser's elite minions.
Redemption Promotion: In exchange for their wavering loyalty, Sergeant Guy and his squad were promoted to being members of Bowser's elite guard in the ending of Bowser's Inside Story and their new position carries over to Dream Team... until Kamek demotes them for losing a fight against Mario.
Ring Out Boss:
- While it's not to the point where it's immediately lethal, the battle against Earthwake provides an opportunity to deal a lot of damage to whomever runs out of ground and falls into the water.
- But the giant battle against Bowser, however, mainly has this working against you since the ground behind Luigi is constantly being destroyed throughout the fight. And the battle ends with a content of repeatedly pushing Bowser into the magma.
Shockwave Stomp:
- Instead of just running towards an enemy to hit it with a hammer, in the dream world, Mario's basic hammer attack is replaced with him slamming the ground with his hammer to summon several Luiginoids, who do the same thing in order to cause a shockwave.
- Just like in previous installments, some of the bosses are capable of doing this; Big Massif's pursuit attack has Mario not only avoiding where he lands, but the ensuring shockwaves as well.
Shifting Sand Land: While Dozing Sands doesn't have any pyramids, it does have NPCs complaining about the heat, sand flows that you can't climb, monsters hiding under the sand, and the soundtrack that goes with the desert theme.
Stone Wall: Beef Cloud is incapable of actually attacking. However, he constantly heals every few seconds and has an unusually large amount of health compared to the rest of Big Massif's disciples.
Technicolor Fire: Due to being infused with the Dream Stone's power, the flames that Dreamy Bowser exhales have an multicolored hue to them.
Tennis Boss: A variation with Private Goomp of the Elite Trio, who sends several Goombas charging towards Mario, ordering them to turn back every time Mario reverses their direction by jumping on them. The Private can't keep the rally going indefinitely, as he's eventually run over by his own troops for being too slow on the draw.
Training Boss: The first battle of the game pits Mario against Antasma, one of the main villains. Despite his prominence, Antasma is incapable of dealing any damage, and this fight is essentially an opportunity to get used to the jumping mechanics.
Villain Team-Up: The only reason why Bowser is working with Antasma is because the latter promised Bowser a source of infinite power, and he also manages to fulfills his part of the bargain.
Villainous Crossdresser: Although it was part of a ruse, a derailed conversation with Kamek reveals that he enjoys dressing up as Peach in his free time.
Warmup Boss: The battle against Dreamy Mario is where the game stops holding your hand: No advice, no explaining the enemy's abilities, and it's as long as an regular boss battle.
Wake Up Call Boss: During the first major trip through Dreamy Wakeport, Big Massif tasks the heroes with defeating his four students, each of which requiring a specific condition to be met in order to defeat them while they use a portion of Massif's moveset. And if the hint wasn't blatant enough, Big Massif hits like a runaway freight train and is arguably the first boss in the game where dodging your opponent's attacks is essential for survival.
You Have Outlived Your Usefulness: With the Dream Stone fully charged, Antasma being a potential rival after providing the Dream Stone and also wanting to take over the world, and the Mario Bros. closing in to the top of Neo Bowser Castle; this is Bowser's justification for throwing Antasma to the ground and leaving him to fend for himself against the heroes.
Your Costume Needs Work: An employee within the staff room of Pi'illo Castle wants to meet the Mario Bros.; despite actually talking to them, she brushes them off because they didn't live up to her expectations.
Zerg Rush: A lot of enemies in the Dream World will launch an attack against Mario by charging towards him in a group or attacking in quick succession, as opposed to the genre's standard of everyone taking a turn to individually strike somebody.
Zero Effort Boss: The very first battle of the game pits Mario against an weaken Antasma, who's incapable of dealing any damage.