Vanish Cap from Super Mario 64
The Vanish Cap is a blue cap which is acquired after destroying a solid blue Question Block. After putting the Vanish Cap on, Mario turns temporarily near-invisible, allowing him to run through enemies, meshes barriers and certain types of walls. Invulnerability from enemies is granted alongside this. The Vanish Cap is found in Super Mario 64 in blocks in Jolly Roger Bay, Snowman's Land, Wet-Dry World and Vanish Cap Under the Moat.
In Super Mario 64 DS, Luigi can take on the abilities the Vanish Cap grants, but instead he uses a Power Flower to do so.
 Power-ups in the Super Mario series 
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Mushrooms: |
The Vanish Cap