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The Basement is a bonus floor in Mario vs. Donkey Kong: Minis March Again!, unlocked after the player completes the main game. On the level select screen, it is placed before Floor 1, Mini Mayhem. Each level in the Basement is unlocked by obtaining a certain amount of stars throughout the game.
The Basement contains courses that are more difficult than usual. The enemies featured on this floor are Capture Kongs, Piranha Plants, Snifits, Polterguys, and Thwomps. It also features Conveyor Belts, Magnets and the ubiquitous Pink Blocks among many other elements.