From the Super Mario Wiki
Certainty Switches are a special switch in Wario Land: Shake It! When Wario hits one, they turn the Uncertain Blocks of their respective color into solid blocks. There are three colors of switches and blocks: red, blue, and yellow. These blocks are always located near Uncertain Blocks and sometimes, more than one of the same color appear. In the Japanese version of the game, Certainty Switches have the words ON and OFF imprinted on them, while in the other versions, there are no words inscribed on them, instead opting for a circle of their respective color in their center.
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