Certainty Switch

Certainty Switches are a special type of switch exclusive to the game Wario Land: Shake It! When Wario hits one, they will turn the Uncertain Blocks of their respective color into solid blocks. There are only three colors of switches and blocks: red, blue, and yellow. Wario can hit these switches with either an enemy, a ball, or by himself. These blocks are always located near Uncertain Blocks and sometimes, more than 1 of the same color appear.

Trivia

 * In the Japanese version of the game, Certainty Switches have the words ON and OFF imprinted on them. However, in the other versions, they don't have any words inscribed on them. Instead, there is a circle of their respective color located in the middle.