US Patent 10543427 Game controller function remapping via external accessory

A game controller includes a plurality of controls, an accessory interface configured to removably affix an external accessory to the game controller, and a control mapping machine. The control mapping machine is configured to map a control of the plurality of controls to a first function while the external accessory is not affixed to the game controller, and map the control to a second function different than the first function while the external accessory is removably affixed to the game controller.