From the Super Mario Wiki
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The Mini Mario begins on a platform over to the far left on the lower level and the Mini Toad just above and to the left of it, with the Mini Mario door at the top center and the Mini Toad door at the top right. In order to reach it, the Mini Mario must use the Long Spring on the upper level while headed left to free the Mini Toad, then both must use the Long Springs to enter their respective doors.
Mini Mario Card
The Mini Mario Card is located in the center, just below the Mini Mario door. The Mini Mario must simply be led to the upper level and have a Red Girder bridge drawn over it.
In order to earn a trophy, the player must score 14600 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Peach.
In order to earn a trophy, the player must score 14000 points.