From the Super Mario Wiki
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The Mini Marios begin at the top center, with the exit door at the top left. In order to reach it, they must simply be guided via a series of Blockers and Magnet Blocks to switch their order so that the Mini Mario with the key leads them.
The M-Token is located near the very center, near a Magnet Block on the middle level. To collect it, the Mini Marios must fall onto the middle Blocker while heading right and follow the Magnet Block to it.
Mini Mario Card
In order to earn a trophy, the player must score 14200 points.
In order to earn a trophy, the player must score 13100 points.