The story of Fantasy Zone revolves around Opa Opa Jr., the son of the previous game's hero, who is on a mission to rescue his father from the evil aliens. The player must navigate through increasingly difficult levels while fighting off enemy forces and bosses.
The gameplay is an arcade-style shooter for one player, where the goal is to defeat boss enemies guarding the exits of the levels and progress further. Players can also upgrade their ship with better weapons and engines.