From the Super Mario Wiki
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The course features two minis.
One mini toy starts on a girder platform in the middle of the course, while the other mini starts lower to the left on the ground. The Goal Door is located on the left side of the course at the middle. In order to reach it, the minis should be guided there with Pink Blocks. A Yellow Spring under the girder can be used to reach the same level as the door.
Mini Mario Card
The Mini Mario Card is in the top left corner of the course. The player can guide the minis to it by creating a staircase of Pink Blocks from the girder in the middle to the platform with the card.