From the Super Mario Wiki
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The level features two Mini Marios.
The Mini Marios begin near the top left on a platform on the upper level, with the exit door located to the left of them past a ladder. In order to reach it, they must simply be guided via a series of Movable Pipes and Blue Ladders to it.
The M-Token is located at the top center, atop a platform on the upper level. To collect it, the Mini Marios must simply walk up to it via Blue Ladders.
Mini Mario Card
The Mini Mario Card is located near the very center, just below the M-Token. The Mini Marios must simply use the Blue Ladder to reach it.
In order to earn a trophy, the player must score 14500 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Toad.
In order to earn a trophy, the player must score 13900 points.