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The Mini Marios start in a triangle formation in the center of the course; two of them on Magnet platforms and the third on some Pink Blocks in an enclosed area. Using Pink Blocks, the minis have to be guided to one of the vertical Magnet Rods on the sides of the level and then flipped to the other side of them, allowing the toys to climb to the top of the stage. Once there, the minis can be guided with Pink Blocks to the Goal Door in the top left from one of the platforms nearby. The Key Mini Mario should be brought to the door first to unlock it, followed by the other two Mini Marios.
Mini Mario Card
The M-Token is at the top of the rightmost Magnet Rod, on its left side. The minis can simply be guided with Pink Blocks to the Magnet Rod which they will start climbing. Immediately after collecting the token, the minis should be flipped to the other side of the Magnet Rod to avoid walking into a pair of Piranha Plants ahead of them.