A distinct variation of an analog joystick is a positional gun, which works differently from a light gun. Instead of using light sensors, a positional gun is essentially an analog joystick mounted in a fixed location that records the position of the gun to determine where the player is aiming on the screen. It is often used for arcade gun games, with early examples including Sega's "Sea Devil" in 1972; Taito's "Attack" in 1976; "Cross Fire" in 1977; and Nintendo's "Battle Shark" in 1978.