Hat Switch

From the Super Mario Wiki
Wario with the Hat Switch

The Hat Switch is an object in Wario: Master of Disguise. They are very big versions of the Wario Cap and when Wario steps by one, Wario is able to save his game. Many Hat Switches are found in the game, and they are first seen in the top left corner of the first level of the S.S. Caviar, by a breakable floor. They are then seen in every level of the game. The Hat Switches always stay on the ground, and Wario cannot pick them up or do anything with them except save his game.