It is mainly found by jumping into green [!] Blocks and looks Mario's regular cap but with a metallic texture applied to it.
Effects of this Cap Edit
Upon collection, Mario will put on the Metal Cap and turn into Metal Mario. With this cap, his weight and physics will be altered and he will be mostly invulnerable.
As Metal Mario, Mario is immune to the toxic gas in Hazy Maze Cave, can't drown and can't be harmed by lava. He also can't be blown away by Fwooshs, but unfortunately, the price for his borderline invulnerability are, that he can't perform any jumps beside the regular one and the backflip while in this state.
On land, he will become very slow and he can't swim, but when he is submerged, Metal Mario's physical will behave similarly to regular Mario's on land physics. While this allows Metal Mario to press submerged switches, which no other form can, he is susceptible to bottomless pits and quicksand, as Metal Mario sinks faster due to his increased weight. These will end Mario's life even if he is in his Metal Mario form.
Just like with any other cap, Mario will turn back into his regular state once an unseen timer runs out.
- Metal Mario still coughs when idling in the toxic gas of Hazy Maze Cave, despite being otherwise immune to it
- If Metal Mario ends up in the lava, he will still leap around with his behind on fire, but won't be harmed by it
- Some hacks of Super Mario 64 use this as a challenge, which includes Mario scaling firefalls while in his Metal Mario form, which is a feature, that isn't used in the original game, but would certainly be possible
- Metal Mario makes a cameo in Super Smash Brothers for the Nintendo 64, where he is fought as a boss near the end of the game