Tetrastar: The Fighter is a pseudo-3D Space Harrier style shooter with action in the future. The events of the game take place in 2089 AD. The Baal Empire attacks Earth, and the player assumes the role of a pilot of the Tetra Star - a special ship of the resistance.
The player-controlled ship can move around the screen and fire a standard Vulcan gun or one of four special weapons. He fights against various enemies and bosses. The game has seven stages in various locations: for example, in the first mission the protagonist prevents New York from being destroyed, while other missions take place in warp gates or other planets.