The Nintendo 64 Controller was used as the primary form of input for the Nintendo 64 console. It featured two major innovationsâ€“the introduction of the analog stick and a trigger behind the controller. It was also the first Nintendo developed controller that allowed for expansion, with the memory card and rumble pak being the main attachments. It also included a red start button, four yellow "C" buttons, an A and B button, a D-Pad, and an L and R button. The N64 is the first Nintendo console that allows up to four controllers at once, whereas previous consoles only allowed two.