From the Super Mario Wiki
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The level is made up of several floors with many Pink Block and Movable Pipe outlines to help the Minis commute through the level by turning them solid. There are also two Cannons on the left side of the stage. First using the Mini Mario, which starts at the bottom in the middle, the player has to free and recruit all Minis scattered around the stage, then bring them to their respective Goal Doors. The positions of these doors are as follows: Mini Mario's door is two floors above Mini Mario's starting position, Mini Pauline and Mini DK's doors are located one above the other at the left, and Mini Peach's is at the same level as Mini Toad's on the top floor.
The M Coin can be found at the mouth of a Movable Pipe outline, which is adjacent to another one beneath it. There is also a cluster of Pink Block outlines above it. It is collected by bringing the Minis there either via Movable Pipes or Pink Blocks.
The following data applies in both the Nintendo 3DS and the Wii U versions of the game.