Room B-8 is the eighth and last course of the Basement in Mario vs. Donkey Kong: Minis March Again!. It is unlocked by earning all 99 gold stars from previous levels, making it the final course of the game. The theme of the course is a shorter version of the track that plays in the levels of DK's Hideout from Mario vs. Donkey Kong 2: March of the Minis, barring the drum beats, and is an arrangement of the 25m theme from Donkey Kong and "DK Island Swing" from Donkey Kong Country.
All minis start in a long row at the top left of the course. The Goal Door is located on a lone platform towards the middle bottom, above a long bed of spikes. From the minis' starting positions, the player can use Pink Blocks to direct the toys on various splitting paths filled with Coins and objects such as Pipes, Magnets and a conveyor. All paths converge into an area at the bottom with grids where the player can place Pink Blocks over spikes to lead the minis to the Goal Door.
Mini Mario Card
The Mini Mario Card is at the top left of a vertical Magnet Rod on the right side of the stage, right under a Magnet. From the starting position, a mini has to be directed with Pink Blocks to the path lower to the right, where it will enter the Magnet and eventually walk down the Magnet Rod. The player can either flip the Magnet Rod along with the mini to quickly obtain the Mini Mario Card while still walking on it downward, or let the toy walk around the Magnet Rod and climb it to the card.