Level 3-3 (Mario vs. Donkey Kong: Tipping Stars)
From the Super Mario Wiki
The course is lengthy, with different floors spanning conveyors and Red Girder Rivets. Mini Mario and Mini Toad start in a small alcove on the left, while Mini Peach is in a tight opening on the far right. Thwomps appear on the ceiling, with open space underneath them to squish any passer-by. However, they can be locked up by drawing Red Girders under them. The player can increase the total number of Red Girders in their stockpile with a few Pickups near the right side of the stage, on the bottom floor. Also on the bottom floor, between two conveyors, is a Split Pipe that is connected to another one on the ceiling, allowing the Minis to reach the topmost platform. The Goal Door is located at the far left side of the stage, beyond a pair of Thwomps.
The M Coin stands on the platform under the pipe in the ceiling, immediately left from it. To collect the coin, the Minis should enter the bottom floor pipe from the right.
The following data applies in both the Nintendo 3DS and the Wii U versions of the game.