The Atari 2600 controller was about the simplest game controller you could imagine. No triggers, no D-Pad, no shoulder buttons, no haptic feedback or rumble pak. It consisted of just a joystick and a single red button you mashed with your thumb...
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This hilarious game is made of 56 frantic minigames that you only need a single button to play
Source: PC Gamer (opens in a new tab)