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 top right while another begins near the very center and the other begins near the bottom right, with the exit door on the bottom right. In order to reach it, they must simply be guided via a series of Pokey Blocks and Purple Conveyors to it while avoiding Pokeys.
The M-Token is located at the top left, just above a Pokey. To collect it, a Mini Mario must follow a diagonal Purple Conveyor to it after they lure the Pokey to a Pokey Block.
Mini Mario Card
The Mini Mario Card is located at the middle left, on a ledge above a Pokey. A Mini Mario must lure both Pokeys into the Pokey Blocks, then drop down from the higher Pokey Blocks.
In order to earn a trophy, the player must score 15100 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the two Mini Toads.
In order to earn a trophy, the player must score 13400 points.