From the Super Mario Wiki
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The course features three Mini Toads. It is one of the three courses (aside from Room R-1 and Room R-2) that need to be completed in order to unlock the option to replace the minis in most courses with Mini Toads.
All three Mini Toads start in the bottom left. They stand on an array of Pink Blocks right above a spike-covered ground. The player must use Pink Blocks to lead the minis to the Goal Door, located further to the right. The door is initially standing on some blank Pink Block spaces, requiring the player to fill them in in order to make the ground underneath solid and allow the minis to enter the door.
Mini Mario Card
The Mini Mario Card is atop a row of Pink Block spaces at the top right, just above the Goal Door. It can be obtained by guiding the toys there with Pink Blocks.