The Start/Pause Button (just called the Start Button on the Nintendo 64 controller) refers to the small, gray button in the center of a GameCube controller, or the small, red button in the center of a Nintendo 64 controller. It is used on both consoles to pause most games, and select features in the menus. In Super Smash Bros. Melee's Trophy gallery, the Start/Pause Button is also used to change the background.
Players may repeatedly press the Start/Pause or + button to distract the other players, or to disrupt their combo timing, though is considered very rude. In tournaments, pausing can result in the player losing a stock or having to forfeit the match or even the set.