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The input device used to manipulate video games is called a game controller, and varies across platforms.

For example, a controller might consist of only a button and a joystick, while another may feature a dozen buttons and one or more joysticks.

Early personal computer games often needed a keyboard for gameplay, or more commonly, required the user to buy a separate joystick with at least one button .< ref >* Patrick Stack.

" History of video game consoles " Time 2005