From the Super Mario Wiki
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The level features three Mini Marios.
The Mini Marios begin near the top right on a platform on the mid-upper level, with the exit door just below them. In order to reach it, they must be guided via a series of Blue Ladders and Green Pipes.
Mini Mario Card
The Mini Mario Card is located on the bottom right, atop a platform on the lower level right next to a left-facing Green Pipe entrance. A Green Pipe entrance must be drawn so that Mini Mario can fall down from its starting point to the very bottom and enter a Green Pipe to reach it.
In order to earn a trophy, the player must score 14100 points.
In order to earn a trophy, the player must score 13200 points.