From the Super Mario Wiki
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Two Mini Marios, including the one with the key, begin at the bottom left while another begins near the bottom center and the last one begins near the bottom right, with the exit door at the bottom left. In order to reach it, they must simply be guided via a series of Red Girders while watching out for Shy Guys and a Piranha Plant.
The M-Token is located near the bottom left, suspended in midair. To collect it, the Mini Marios must slide down a Red Girder slope to it.
Mini Mario Card
In order to earn a trophy, the player must score 14300 points.
In Plus Mode, the two Mini Marios must be guided to the exit door first, followed by the two Mini Donkey Kongs.
In order to earn a trophy, the player must score 13400 points.