From the Super Mario Wiki
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The level features three Mini Marios, though not necessarily in the same starting positions.
The Mini Marios all begin at or near the bottom area, with the exit door near the middle right. In order to reach it, they must simply be guided via a series of Long Springs, Blockers, and Cannons to it.
The M-Token is located near the top right, blocked off by Crumble Blocks. To collect it, the Mini Marios must fire diagonally out of the Cannon closest to it.
Mini Mario Card
In order to earn a trophy, the player must score 15500 points.
In order to earn a trophy, the player must score 13000 points.