Costume Mario

Costume Mario is the form Mario takes after touching a Mystery Mushroom in Super Mario Maker, allowing him to transform into numerous Nintendo and third-party characters, objects and groups or combinations thereof. Upon scanning certain amiibo onto the Wii U GamePad's, an 8-bit version of the amiibo character (16-bit if a Sonic the Hedgehog amiibo is used) will be unlocked in the level editor, allowing the player to use it any time from then on without having to scan the amiibo again. In addition to amiibo characters, Mario can also transform into certain objects, such as a ? Block. Costumes can also be unlocked through the 100 Mario Challenge mode, including the characters which have amiibo unlock conditions.

According to Nintendo's website, nearly every confirmed amiibo is compatible, except the Mii Fighters and Shovel Knight. There are a total of 125 costumes in the game so far, consisting of 100 base costumes (95 of which can be unlocked by completing the 100 Mario Challenge), and 25 additional ones that are gained from Event Courses or free updates. There is a possibility that there could be 99 additional costumes available.

This power-up was concieved after the development team was struggling to find an interesting and effective use of amiibo for the game. Acording to Takashi Tezuka, the art designers pitched the idea of changing Mario's sprites after drawing some of the amiibo characters in a pixel art style.

Costume Mario functions the same as Super Mario, but with Small Mario's physical stature; although some of the costumes are slightly larger. While Mario wears a costume, he cannot wear any Shell Helmets or collect a Fire Flower. In addition to appearance, various sound effects may also be changed to reflect the character, such as the jumping sound effects and "Course Clear" fanfare. The power-up sound effect may also be replaced by a different sound effect from the character's home series. The non-DLC Pokémon series costumes are notable for lacking special sound effects, instead using the standard Super Mario Bros. sounds. Each character has a unique pose if the player presses and holds. The messages seen after finishing the 10 Mario Challenge and the 100 Mario Challenge also varies depending on the appearance of the player.

Mario can only transform into Costume Mario in the Super Mario Bros. style of the game. If the player changes game styles while Mario is in his Costume Mario form, he'll either change into Raccoon Mario (Super Mario Bros. 3), Cape Mario (Super Mario World), or Propeller Mario (New Super Mario Bros. U).

The costumes do not follow the graphical limitations of the NES. Most of them are designed to follow the characters' official designs, usually using more than 3 colors.

Originally, the costumes were known as Mystery Suits ; however, the name was dropped in the final version of the game.

Toad can say different things to Mario when costumed. For example, upon clearing the 10-Mario Challenge or 100-Mario Challenge on Easy, in the Peach suit, Toad will say, "Princess Peach?! How did you escape! ...Oh. It's just a costume."

Trivia

 * Despite being costume number 112, the Sky Pop costume and the level in which it was introduced were released after costumes 113 to 118.
 * In the amiibo compatibility list on the official Nintendo website, the Wolf Link amiibo isn't marked as compatible for Super Mario Maker, which is incorrect.
 * In the English versions for Super Mario Maker, when the Wolf Link costume gets unlocked, the text for its name and game of origin were accidentally left unchanged in the Japanese text instead fixing to the English text in the Mystery Mushroom costume menu.
 * Along with the Wolf Link event course, an event course for a Mary O. costume was released, with "test" as its title and description, implying an error concerning a premature release of the course. It was soon removed from the server, but was still playable in the time it was up, granting the players the costume early.