Magnet Mania
From the Super Mario Wiki
Magnet Mania is an underground place in Mario vs. Donkey Kong 2: March of the Minis. It is the fourth world. The walls here are magnetic, so Mini-Marios can walk on the wall. The enemies infest here are Sparks, Piranha Plants, Thwomps, Mini-Shy Guys, and Cool Kongs.
This is also the third world from March of the Minis sequel, Mario vs. Donkey Kong: Minis March Again!. In this game, the obstacles are the same.


