From the Super Mario Wiki
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The course contains a wide arrangement of Magnets, Purple Conveyor Rivets and High Springs placed at different levels. There are also several Conveyor Switches to flip the direction of any Purple Conveyor present in the area. A Mini Mario, initially the sole playable toy, starts in the left half of the stage and has to rescue all the other Minis trapped in capsules, located in various positions throughout the level. They all must then be escorted to their respective Goal Doors. The doors are positioned as follows: Mini Mario's, Mini DK's, and Mini Pauline's doors on the topmost Magnet platforms, Mini Peach's door on the bottom floor underneath Mini DK's door, and Mini Toad's door further to the right, between a Magnet and a slope.
The M Coin is located in the right half of the stage, on a platform above a High Spring. The Minis should bounce from the spring onto a Purple Conveyor that has to be drawn between the two diagonally-placed rivets surrounding the spring. With the conveyor leading upward, the Minis should reach and collect the M Coin.
The following data applies in both the Nintendo 3DS and the Wii U versions of the game.