Mini Mayhem

Mini Mayhem, subtitled Floor 1 (Ground Floor or Floor G in the PAL version), is the first floor in Mario vs. Donkey Kong: Minis March Again!. Being the first floor, all the levels here are relatively simple and easy, allowing the player to adjust to the game mechanics. The floor most notably introduces Pink Blocks, Yellow Springs and Ladders. The only enemies to appear here are Circus Kongs, one in Room 1-7 and two other in Room 1-SP. 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 floors.

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, the first floor in Mario vs. Donkey Kong 2: March of the Minis.

New elements
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.

{|align=left width=100% cellspacing=0 border=1 cellpadding=3 style="border-collapse:collapse; font-family:Arial;" !colspan=3 style="font-size:12px;"|

Pink Blocks
!rowspan=2|In-game description !align=center|North American version !align=center|PAL version
 * align=center|''Pink blocks are a common tool you can use to help Mini Mario reach the exit.
 * align=center|''Pink blocks are a common tool you can use to help Mini Mario reach the exit.

''Use your stylus and tap the pink blocks to suck them up.

''Then tap on a dotted box to place them back into play.
 * align=center|Pink blocks are a common tool you can use to help mini toys reach the exit.

''Use your stylus and touch the pink blocks to suck them up.

''Then touch a dotted box to place them back into play. !Tutorial overview !colspan=3 style="font-size:12px;"|
 * colspan=2|The player has to pick up three Pink Blocks from a grid and place them so that the mini successfully crosses a gap with spikes and reaches the Goal Door.

Springs
!rowspan=2|In-game description !align=center|North American version !align=center|PAL version
 * align=center|''If a Mini Mario walks into a spring, he will jump automatically on to the spring, which will launch him up in the air!
 * align=center|''If a Mini Mario walks into a spring, he will jump automatically on to the spring, which will launch him up in the air!

''Use springs to overcome obstacles!
 * align=center|''When mini toys walk into a spring, they will automatically jump onto the spring, which will launch them up into the air!

''Use springs to overcome obstacles! !Tutorial overview !colspan=3 style="font-size:12px;"|
 * colspan=2|The player has to simply activate the mini and let it walk into a Yellow Spring, which will bounce it to the Goal Door.

Ladders
!rowspan=2|In-game description !align=center|North American version !align=center|PAL version !Tutorial overview !colspan=3 style="font-size:12px;"|
 * align=center|''When Mini Mario encounters a ladder, he will climb or descend the ladder automatically, and then continue walking in the direction he was facing.
 * align=center|''When mini toys encounter a ladder, they will climb or descend the ladder automatically, and then continue walking in the direction they were facing.
 * align=center|''When mini toys encounter a ladder, they will climb or descend the ladder automatically, and then continue walking in the direction they were facing.
 * colspan=2|The player should simply activate the mini and wait for it to descend and climb two consecutive ladders in order to reach the Goal Door.

Key Mini Mario
!rowspan=2|In-game description !align=center|North American version !align=center|PAL version
 * align=center|''In the last regular stage on each floor, the door leading to Donkey Kong is locked!
 * align=center|''In the last regular stage on each floor, the door leading to Donkey Kong is locked!

''Fortunately one of the Mini Marios has the key!

''The Key Mini Mario must unlock the door before other Mini Marios can exit.
 * align=center|''In the last regular level on each floor, the door leading to Donkey Kong is locked!

''Fortunately, one of the Mini Marios has the key!

''The Key Mini Mario must unlock the door before other Mini Marios can exit. !Tutorial overview
 * colspan=2|The player can activate one Mini Mario and wait for it to walk into the other to recruit it. After the minis do a short tour around the stage, the Key Mini Mario eventually reaches the locked Goal Door and unlocks it for both itself and the other Mini Mario.
 * }

Plus Mode
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. There is also the addition of Shy Guys and Snifits as enemies, as well as Pipes, Split Pipes, Conveyor Belts, Conveyor Switches, Pop-up Gates and yellow Box Springs as objects. All of these elements, with the exception of Box Springs, 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. The soundtrack is an original composition.