From the Super Mario Wiki
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The level features four Mini Marios, though not necessarily in the same starting positions.
Two Mini Marios begin at the top left on a platform on the upper level while the other two begin at the middle right on a Girder platform, with the exit door on the middle left. In order to reach it, they must simply be guided via a series of Red Girders and a Circus Kong to it.
The M-Token is located at the top right, atop a Red Girder platform. To collect it, a Mini Mario must simply walk up to it via Red Girder platforms.
Mini Mario Card
The Mini Mario Card is located near the very center, near the Circus Kong. The Mini Marios must simply use the Red Girder platform below to reach it.
In order to earn a trophy, the player must score 15000 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the three Mini Toads.
In order to earn a trophy, the player must score 14300 points.