From the Super Mario Wiki, the Mario encyclopedia
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The course features three mini toys.
All three minis start in the bottom left area of the stage, one of them on a Magnet. The course contains an arrangement of differently-shaped Magnets with grids for Pink Blocks between them. There are also two cyan Split Pipes on each side of the level at the top. To reach the Goal Door in the bottom right of the stage, the minis have to be guided there by Pink Blocks and Magnets.
Mini Mario Card
The Mini Mario Card is under an "S"-shaped Magnet roughly in the top right area of the level. The player can use Pink Blocks to lead the minis to said Magnet and help them collect the card.