From the Super Mario Wiki, the Mario encyclopedia
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The level features three Mini Marios, including one with a key.
The Mini Marios begin on a platform on the lower level on the right, with the exit door at the bottom left. In order to reach it, the Mini Marios must swap positions so that the Mini Mario with the key is in front, then reach the door normally.
Mini Mario Card
The Mini Mario Card is located on the top left, atop a platform on the upper level. The Mini Marios must collect it in the same manner as the M-Token.
In order to earn a trophy, the player must score 15300 points.
In order to earn a trophy, the player must score 14500 points.