From the Super Mario Wiki
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All five Minis begin at various levels, with their respective exit doors being close by to them. In order to reach them, they must simply be guided via a series of Cannons, Red Girders, and Green Pipes to them.
The M-Token is located at the top right, just above the Mini Pauline door. To collect it, a Mini must simply use the Cannon to the left of said door.
Mini Mario Card
The Mini Mario Card is located near the top center, to the right of the Mini Pauline's starting position. Another Mini must use a Green Pipe entrance in order to reach it.
In order to earn a trophy, the player must score 14900 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Toad, then the Mini Peach, then the Mini Donkey Kong, then finally the Mini Pauline.
In order to earn a trophy, the player must score 14100 points.