Quickshot Trackball

The Quickshot Trackball was an NES controller with two buttons, a limited-movement trackball, and a switch to set it for either a right-handed or left-handed player. Like most non-standard NES controllers of the time, it was difficult to work properly, as games usually were not designed with it in mind. An exception is Marble Madness, which turned out to be a natural match for the controller.