From the Super Mario Wiki
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The level features three Mini Marios.
The course is an array of Magnets that run along walls and ceilings. There are also several outlines for Pink Blocks, as well as yellow and red Split Pipes that warp the toys to different sections of the level. The Minis can reach higher platforms and Magnets using Long Springs. The three Mini Marios start in different positions in order and the Goal Door is located near the bottom right. The Minis should first use the middle Long Spring to bounce to the Magnet above, which will lead the toys to a red Split Pipe that warps them before a pit of spikes; they should then cross the pit with Pink Blocks and enter the Goal Door, clearing the level.
The M Coin is between the leftmost wall and a short "L"-shaped Magnet close to it. The Minis should use the red Split Pipes and a few Pink Blocks to reach the coin.
The following data applies in both the Nintendo 3DS and the Wii U versions of the game.