The X button refers to the grey, cashew-shaped button on the right side of the GameCube controller, the small, white button towards the top right of the Classic Controller, or the small circular buttons on the 3DS, New 3DS, and Wii U GamePad. It is used for jumping and changing the color of the character costumes in Melee. The Nintendo 64, Wiimote, and Nunchuk controllers do not have an X button, just like the Y Button.

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