Mad Stalker: Full Metal Forth is a side-scrolling beat ’em up game reminiscent of Kung-Fu Master and The Ninja Warriors, where players assume the role of a policeman taking control of a SlaveGear mecha suit known as Hound Dog through six stages of varying themes set in Artemis City in an effort to defeat a rogue SlaveGear model called Rising Dog, stop a rogue artificial intelligence named Omega, who has become rogue against humankind and destroy its army of robot enemies as the main objective. Prior to starting a playthrough, players have the choice of accessing the options menu at the title screen, where various settings can be adjusted such as controls and any of the three difficulty levels.
