[2] The people of the planet Farmel, having recently gained the technology for space travel, eagerly explored the galaxy only to find a herd of monstrous "Air Fortresses" moving in their direction.

In a final gambit they send a single warrior named Hal Bailman, outfitted with a shielded spacesuit, powerful weapons, and small "lightship" to infiltrate the Fortresses and destroy them from the inside out.

The player also has a chance during this phase to collect energy and "crash beam bullets", a more powerful ammunition that is limited in supply, that can be used inside the Fortress.

The player must navigate through the maze, fight off enemy robots, security devices, and spacemen with their beam weapon, locate and destroy the central core of the Fortress, and find their ship to escape.

VideoGames & Computer Entertainment's Andy Eddy remarked that the game offered "a great deal" of originally with its mixture of arcade and adventure aspects, but found the music to be repetitive and felt that the overall design could have used more color.

[7] Play Time's Oliver Menne highlighted its smooth scrolling and lack of flickering, while praising HAL for their work with the graphics and music.

[4] Game Freaks 365's Stan Stepanic praised the music but felt mixed with the visuals, while criticizing its gameplay and difficulty level.