Mushroom Kingdom U

Mushroom Kingdom U (, Mario U World) is a stage in and Super Smash Bros. Ultimate. is fought here for his unlock battle in Ultimate. and 's unlock battle in World of Light is also fought here in the Slide Lift Tower, while is fought on its Ω form during its unlock battle in World of Light.

Stage overview
This stage possesses four different layouts; it switches between them when Kamek appears and casts a spell.

Acorn Plains
The starting version, set in a grassland. Features a large main platforms with three smaller soft platforms above.

Rock-Candy Mines
Set in the mountains, it features a single rock platform balanced on the tip of a spire; the platform balances like a lever.

Meringue Clouds
Set above pink clouds, features two walled platforms separated by a pit, with floating platforms above the pit and the right platform.

Slide Lift Tower
Set in the inside of a tower, features two solid blocks which move along a rectangular rail. In their movement the blocks rub onto each other, and are able to push fighters and items.

Other
Several other elements and hazards can appear on the stage, independently of the current stage variation:
 * A giant beanstalk which sprouts from the background and grows branches and leaves, which players can use as platforms. The beanstalk disappears after some time.
 * Droplets of water which fall from the sky, soon followed by a giant icicle that freezes any player who touches it while it is falling. After striking the ground, icicles serve as platforms which can be damaged and destroyed by attacks.
 * Water geysers which spout upwards, acting as extra platforms. Players who touch them will be lifted up. Some of these geysers carry damaging Big Urchins on top of them.
 * Various sets of s, small blocks which act as solid platforms can autonomously stretch horizontally.
 * Several Tower-themed soft platforms which traverse the stage horizontally.

Nabbit shows up periodically when the stage transforms. He chases after players and tries to catch them in his bag; once he traps a player he attempts to float towards the upper blast line and KO the opponent, much like the Beetle and Boss Galaga items. Nabbit is treated as a fighter, and therefore is vulnerable to attacks, grabs, and items - he even takes knockback proportional to damage - and can be defeated by being launched beyond the blast lines.

When Nabbit jumps across the pit in the Meringue Clouds variation, it is possible for the player to be caught in his bag mid-jump, causing both the player and Nabbit to plummet off the stage.

Ω forms and Battlefield form
In Super Smash Bros. for Wii U, the Ω form is set on a flat rock platform with grass on top in the Acorn Plains portion of the regular form. Star KOs are possible here. The stage no longer transitions, which means Kamek never appears, and Nabbit, the beanstalk, icicles, water geysers, Big Urchins, and Stretch Blocks have also been removed.

In Super Smash Bros. Ultimate, Ω form and Battlefield form are similar to the Ω form in SSB4; however, the main platform is now made of the grassy soil found at the beginning of the Acorn Plains portion and is resized and reshaped to match and, respectively. The three soft platforms of the Battlefield form are based on the three soft platforms in the Acorn Plains section of the normal form. Oddly, Star KOs can no longer occur here.

Hazards Off
With hazards off in Ultimate, Kamek never appears nor changes the stage, which remains in Acorn Plains for the duration of the match. Nabbit is also removed.

Origin
This stage is a combination of several stages from . The main stage variations are based on: its first world, ; its sixth world, ; its seventh world, ; and the various tower levels, particularly the.

Water geysers, with or without s on top, are common in the world, while falling icicles which can be used as platforms appear in. The beanstalk originates from the Sparkling Waters hidden level:.

Kamek is a high-ranking member of Bowser's army and one of the main antagonists in the series, a Magikoopa who, in the recent New Super Mario Bros. games, appears at the beginning of boss battles to transform the arena.

Nabbit first appeared in New Super Mario Bros. U. He is a rabbit thief who steals items from s: players then can chase him across levels to retrieve the stolen items, being rewarded with a upon capture. Nabbit also appears to take the prize in s if players do not retrieve it in time.

Update History
 

 

Tournament legality
Mushroom Kingdom U is banned from tournaments due to its several disruptive hazards such as icicles, Big Urchins, and Nabbit. It does, however, have a fairly neutral layout with hazards off, which has made its legality more debatable with hazards off.

Trivia

 * In Ultimate, Nightmare, Andross and the Squid Sisters cannot be summoned from an Assist Trophy on this stage. Additionally, Lugia cannot be summoned from a Poké Ball.
 * It is possible for Nabbit to get stuck under the metal platforms from the lift section during a transition and be KOd before even getting a chance to do anything.
 * If Nabbit is not attacked enough when he has a fighter in his bag, he will carry them towards the upper blast line. This action could be a homage to Tac from the universe, a fellow thief enemy that also makes various appearances in the  series.
 * Coincidentally, both of them have the "Item Gravitation" skill as spirits.

Reino Champiñón U