Metal Cap

The Metal Cap is a power-up that appears in Mario 64, turning Mario into Metal Mario. The Metal Cap is unlocked in the stage known as Cavern of the Metal Cap, where you press the Cap Switch, activating the blocks throughout the courses that give the Metal Cap. When used, Mario becomes a metallic texture, invincible, and is weighed down in water. It is used to collect various stars.

Locations

 * Whomp's Fortress
 * Jolly Roger Bay
 * Hazy Maze Cave
 * Cavern of the Metal Cap
 * Dire, Dire Docks
 * Wet Dry World
 * Bowser in the Dark World

Winged Metal Cap
In some personalized levels, a version of the Metal Cap combined with the Wing Cap can be found. It combines the effects of both powerups, allowing Mario to fly normally despite the added weight from being metallic. The model for this cap goes unused in the final game.