Level 4-5 (Mario vs. Donkey Kong: Tipping Stars)
From the Super Mario Wiki
The course is an arrangement of tunnels with gaps, featuring a number of Movable Pipe outlines, as well as a few Red Girder Rivets scattered across it. Cannon Kongs that face different directions are likewise present at various levels. The two Minis start in different positions in the level and have to be brought into the Goal Door on the bottom floor. However, the door is protected by a Cannon Kong that will shoot the Minis straight upward if they approach it. To bypass the enemy, the Minis have to grab a pair of Hammers on the left side of the course and arrive at the Cannon Kong to stun it.
The M Coin is next to the Movable Pipe in the center of the course.
Nintendo 3DS version
Wii U version