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Mario under the effects of the Boo Mushroom. 
The Boo Mushroom is another item that appeared in Super Mario Galaxy and its sequel. This item transforms Mario or Luigi to its Boo form. While you're in Boo mode, you can turn invisible, see through walls, and float up in the air as long as they stay in the dark. If they see the light, then they will return to its plumber form.

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