Boo Mario

Boo Mario is a form of Mario that appears in the game Super Mario Galaxy. As its name implies, the Boo Mario form is Mario disguised as a Boo, although his hat and face remain relatively the same.

In order to change into Boo Mario, Mario must grab a Boo Mushroom. With this transformation, Mario can turn himself invisible and pass through certain walls by swinging the Wii Remote, and levitate by pressing the A button. Mario can attract Boos as well, and use them for various purposes. The transformation is lost if Mario takes damage or passes through a beam of light. Mario first uses this transformation in the Ghostly Galaxy to rescue Luigi. Because Luigi is afraid of ghosts, he cowers when Mario approaches him in Boo form; therefore, Mario must return to his normal form beforehand.