The X button refers to the grey, cashew-shaped button on the right side of the GameCube controller or the small, white button towards the top right of the Classic controller. It is used for jumping and changing the colour of the character costumes in Melee. The Nintendo 64, Wiimote, and Nunchuk controllers do not have a X button.
| Controllers and buttons | |
|---|---|
| Nintendo 64 controller |         
|
| GameCube controller |           
|
| Wii Remote (and Nunchuk) |           
|
| Classic Controller | LR       
|
| Nintendo 3DS |            
|
| Wii U GamePad / Pro Controller | L R           
|
| Joy-Con |                
|
| Switch Pro Controller | LR
|
| Third-party controllers | Hori Mini Pad · Arcade controller · Keyboard |
| Other | Smash Controller · Controller modification |