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Level B-8 is the eighth and last course in the Bonus 1 set and the eighth Bonus Level overall in Mario vs. Donkey Kong: Tipping Stars. It is set in Crumbling Cavern and is unlocked by earning 32 trophies.
The course contains an arrangement of paths with Red Girder Rivets, Movable Pipe outlines and Ladders. The Cursed Mini Mario begins at the top of a Ladder on the left and, without the player's input, starts going down the Ladder, then enters a Movable Pipe and exits on the other side at the top of the stage, falling back to its initial position. The other toys start on the right side on different platforms, next to another Ladder. A pair of Hammers lies at the far left side of the stage, next to an horizontal Movable Pipe outline where the Minis can be warped to. With the Hammers in their hands, the Minis should encounter the Cursed Mini Mario and hit it to revert it to a normal state. Alternatively, the player can draw a sloped Red Girder above the pit of spikes in the middle and have the Minis slide down on it to attack the Cursed Mini Mario. Afterwards, all toys should be escorted to the Goal Door at the top right using Red Girders.
The M Coin is positioned right from the Movable Pipe outline at the top. The Minis can warp there or simply use Red Girders to collect the coin.