From the Super Mario Wiki
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The course features three mini toys.
Two minis start next to each other on a girder platform in the top right corner of the stage, while the third mini starts lower on the left side. The Goal Door is located towards the bottom in the middle. To reach it, the minis have to be guided there with conveyors and Pink Blocks. Some gaps that allow the minis to descend towards the Goal Door are blocked by Pink Blocks that need to be removed. Yellow Springs also appear in the level, giving the minis a boost to platforms and Coins.
Mini Mario Card
The Mini Mario Card is located in the bottom left, under a short girder platform. To reach and collect it, the minis have to be guided in that area by a conveyor and then with Pink Blocks over the spike pit next to the card.