The story of Sigma 7 takes place on a mysterious planet where an alien named Dr. Vortex has stolen powerful technology from Earth. The player must navigate through various levels, fighting against Dr. Vortex's robots and other enemies to retrieve the stolen tech and rescue the hostages.
The gameplay of Sigma 7 is fast-paced action-adventure that requires skill and strategy to progress. Players control a character who can jump, shoot, and move left and right through levels filled with obstacles and enemies. The game features simple yet challenging level design, requiring players to use their wits to overcome challenges and defeat bosses.
Sigma 7 was released for the ZX Spectrum in 1987 as an action-adventure game.