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Mini Mayhem is the first floor in Mario vs. Donkey Kong: Minis March Again!.
In Normal Mode, it is subtitled Floor 1 (Ground Floor or Floor G in the PAL version). Being the first floor, all the levels are relatively simple and easy, allowing the player to adjust to the game mechanics. The only enemy to appear on this floor is a single Circus Kong in Room 1-7. The backdrop depicts a blue sky and green hills all painted onto a metal wall, with fake clouds hung from strings scrolling across the roof. The soundtrack of this floor is reused from Mushroom Mayhem in Mario vs. Donkey Kong 2: March of the Minis. The Mini Mayhem Construction Kit is available by default in the Construction Zone, unlike other Construction Kits, which must be unlocked by completing their respective worlds.
In Plus Mode, the floor is subtitled Floor 1+ (Ground Floor+ or Floor G+ in the PAL version). Here, the rooms are slightly harder than the normal floor, with each level being significantly bigger. There is also the addition of Shy Guys and Snifits, which are added to the Mini Mayhem Construction Kit once the floor is beaten on Plus Mode. The backdrop is mostly the same as in Normal Mode, with the only difference being the orange-colored sky. Also, the soundtrack is an original composition.
This floor contains tutorial levels that showcase Pink Blocks, Springs, Ladders and the Key Mini Mario. The player can access and play them by tapping on the "?" icon in the bottom right corner of this floor's level select screen.