From the Super Mario Wiki
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The course stretches over many irregular platforms that contain Blue Lift Rivets. These can be connected to form elevators that shift the Minis from the bottom floors to the top ones and vice-versa. Long Spring slots are also dispersed among the platforms, helping the toys skip gaps or climb higher grounds. The Key Mini Mario and the Mini Toad start at the left, followed by the Mini Peach further to the right and the Mini Pauline even farther.
The player has to lure the Minis to the Goal Door on the far right side of the stage, ensuring that the key Mini Mario unlocks the door before the other Minis can use it.
The M Coin is located in the middle of the course, next to a blue rivet and a short ledge. The only way to collect it is to take a Blue Lift from the upper platforms and descend right next to the coin on the ground.
Nintendo 3DS version
Wii U version