From the Super Mario Wiki, the Mario encyclopedia
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The Mini Mario begins at the bottom right on a platform on the lower level while the other Minis begin on the mid-upper level, with the various exit doors on different levels. In order to reach them, they must be guided via the series of Red Girders and Blue Ladders.
The M-Token is located near the middle right, just across from the Mini Peach door. To collect it, a Mini must simply follow a Blue Ladder down to it or use the nearby Red Girder platform.
Mini Mario Card
The Mini Mario Card is located on the top left, atop a platform on the upper level right next to the Mini Toad door. A Mini must pass the Mini Toad door while heading left to reach it.
In order to earn a trophy, the player must score 13600 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Peach, then the Mini Donkey Kong, and lastly the Mini Pauline.
In order to earn a trophy, the player must score 12400 points.