Costume Mario

Costume Mario is the form Mario takes after eating a Mystery Mushroom in Super Mario Maker. Upon scanning certain amiibo onto the Wii U GamePad's, an 8-bit version of the amiibo character, known as a Mystery Suit , 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. Mystery Suits can also be unlocked through the 100 Mario Challenge mode including characters which have amiibo unlock conditions. There are a total of 99 Mystery Suits in the game.

As Costume Mario, the Mystery Suits Mario wears function the same as Super Mario, but with Small Mario's physical stature (except Mega Yarn Yoshi, Charizard, Mewtwo, Lucario, Greninja and Sonic, who are slightly larger). In addition to appearance, while wearing a Mystery Suit, 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. (It is also worth noting that the Pokémon Mystery Suits do not have unique sound effects, instead using the standard Super Mario Bros. sounds.) Mario can only transform into Costume Mario in the Super Mario Bros. style of the game, additionly all mystery suits can do a pose by pressing. According to Nintendo's website nearly every confirmed amiibo will be compatible, except the Mii Fighters. Also, Toad's message after finishing the 10 Mario Challenge and the easy mode of the 100 Mario challenge varies depending on the appearance of the player.

It's worth noting that the Mystery Suits do not follow the graphical limitations of the NES, as most of them are designed to follow the character's official designs by using more than 3 colors. Examples include Peach, Toad and Dr. Mario from the Mario series, and all the characters from the Star Fox and Fire Emblem series among other series.