From the Super Mario Wiki
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The course features three mini toys.
One mini starts on a girder platform in the bottom right while the other two minis start further to the left. The Goal Door stands on a Pink Block grid in the top right, placed above a row of spikes. There is a four-Pipe fork connected by a Rotate Pipe in the center of the course, which can be entered from underneath by using Pink Blocks or a yellow Box Spring. In order to reach the Goal Door, the player should adjust the Rotate Pipe to lead the minis from the Pipe they entered to the top area of the stage, then further help them with Pink Blocks (and, if needed, another yellow Box Spring) to bring them to the door.
Mini Mario Card
The Mini Mario Card is in a small indentation on the left wall under the Goal Door. The player can use Pink Blocks to help the minis walk across the pit of spikes preceding the card and reach it.