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|Mario's Cap is an important part of Mario's clothing. The hat is red and has Mario's "M" symbol. This hat has appeared in every game featuring Mario. Mario has worn the same hat since he was a baby.
Mario was given his hat in his first appearance in Donkey Kong because of the limited advances in video game graphics when the game was made. A red cap was added because programmers found it difficult to create the hair movement that would occur when the character jumped.
The hat has appeared with Mario ever since then, but was unimportant until Super Mario 64 - the first game in which Mario can lose his hat. If his hat is lost (having been stolen by a Ukiki or Klepto or blown off by a gust of wind, for instance), Mario takes more damage when attacked. The same is true in Super Mario Sunshine, but with the added effect of Mario gradually losing health due to the heat. The only enemies that steal Mario's Cap in this game are Swipin' Stus.
In the remake of Super Mario 64, Super Mario 64 DS, Toad reveals that the cap Mario wears is special, and that if it were to get blown off of Mario, he would have nothing but bad luck. As hinted in Super Mario 64 DS, Mario's Cap may be a source of his strength, though this does not apply in other games where Mario can have his hat off. If Mario loses his cap, he can get it back by going back to the course in which he lost it to find it. However, if he instead gets a Power Star from another course, he can simply talk to Toad (who will find and wear Mario's Cap) and get it back from him. Mario's Cap appears in the following courses, even when he is locked: Bob-omb Battlefield (Star 2 or 4), Whomp's Fortress (Star 1 or 2), Jolly Roger Bay, and Cool, Cool Mountain (Star 2). Mario's Cap can also be found in most levels when playing as Yoshi. Yoshi, Luigi, and Wario can pick up the cap, which gives them the appearance and abilities of Mario (though they retain their voices) until they lose it, get hurt, or finish a level.
The cap's importance to Mario is stressed again at the end of Super Mario Galaxy 2, when Luma takes it with him as a souvenir before returning to the Comet Observatory with Rosalina, and Mario appears shocked to no longer have it. Following this, Mario is seen capless throughout the credits, but regains his cap when he is playable again. The same thing happens when the player is Luigi.
In Super Mario 64, Mario makes use of three different types of caps in addition to his regular cap: the Wing Cap (which enables Mario to fly), the Metal Cap (which enables Mario to walk underwater and through fire), and the Vanish Cap (which enables Mario to walk through certain walls). While these powers are dispersed amongst Mario and his companions in Super Mario 64 DS, Mario's Cap gains a new ability: when worn, it turns Luigi, Yoshi, or Wario into Mario. If Mario loses his cap, he can't fly, use other caps, or use Power Flower abilities.
Due to certain glitches in Super Mario 64, it's possible for Mario to end up with more than one cap; the duplicate can be used as an effective weapon. In Super Mario 64 DS, if someone wearing Mario's Cap gets another cap, they get an Extra Life. However, if the real Mario gets another one of his caps from a certain glitch in Snowman's Land, he'll pick up the cap and nothing will happen.
When Mario collects almost any power-up, his cap will change color.