OneShot

From Videogame Interface Wiki

The OneShot is a unique combination of standard controller and lightgun, designed for first-person shooters.

It switches between two forms. One form looks like a standard controller, with two analogue sticks and some buttons, but by twisting it it becomes a gun shape which works as a pointer/lightgun. This lightgun mode fires an infrared beam at the screen, that is detected by a separate camera.

See Also