Mushroom Kingdom U
Mushroom Kingdom U (マリオUワールド, Mario U World) is a stage in Super Smash Bros. for Wii U and Super Smash Bros. Ultimate. Bowser is fought here for his unlock battle in Ultimate. Peach and Daisy's unlock battle in World of Light is also fought here in the Slide Lift Tower.
This stage possesses four different layouts; it switches between them when Kamek appears and casts a spell.
The starting version, set in a grassland. Features a large main platforms with three smaller soft platforms above.
Set in the mountains, it features a single rock platform balanced on the tip of a spire; the platform balances like a lever.
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.
Several other elements and hazards can appear on the stage, independently of the current stage variation:
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 blast off smoke towards the upper blast line, 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.
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 can occur. The stage never 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 in the beginning of the Acorn Plains portion and is resized and reshaped to match Final Destination and Battlefield, 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.
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.
This stage is a combination of several stages from New Super Mario Bros. U. The main stage variations are based on: its first world, Acorn Plains; its sixth world, Rock-Candy Mines; its seventh world, Meringue Clouds; and the various tower levels, particularly the Slide Lift Tower.
Water geysers, with or without Big Urchins on top, are common in the world Sparkling Waters, while falling icicles which can be used as platforms appear in Frosted Glacier. The beanstalk originates from the Sparkling Waters hidden level: Skyward Stalk.
Kamek is a high-ranking member of Bowser's army and one of the main antagonists in the Yoshi 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 Toad Houses: players then can chase him across levels to retrieve the stolen items, being rewarded with a P-Acorn upon capture. Nabbit also appears to take the prize in enemy courses if players do not retrieve it in time.
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.
Super Smash Bros. for Wii U
Super Smash Bros. Ultimate