From the Super Mario Wiki
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The level features three Mini Marios, though not necessarily in the same starting positions.
One Mini Mario begins at the bottom left while the other two begin closer to the very center, with the exit door on the top left. In order to reach it, they must simply be guided via a series of Red Girders and Cannons to it while avoiding Piranha Plants.
The M-Token is located at the top right, in an alcove on the upper level. To collect it, a Mini Mario must fire into the alcove from the Cannon at the top right but make sure a Red Girder is placed down to support it.
Mini Mario Card
The Mini Mario Card is located near the bottom left, just above the lone Mini Mario. A Mini Mario must use the Cannon nearby and fire in the diagonal direction to it.
In order to earn a trophy, the player must score 14700 points.
In order to earn a trophy, the player must score 13500 points.