Sigma Seven

Sigma Seven is a space-themed arcade shooter.

As leader of the Sigmonian race, you defend your planet against seven levels of marauding aliens.

The player controls a small ship which can move in all directions and fires in the direction it is facing. The player encounter a number of square alien vessels which move randomly about the screen and attempt to shoot the player. The player's goal is to shoot all vessels on each level, while avoiding alien gunfire, to advance to a more difficult challenge. After clearing a stage, a giant Greek character Sigma transports the play's ship back to the docking bay on the right of the screen. The player has limited fuel per ship, and must clear a stage during this time-frame or lose a ship. The player has a total of 3 ships, and when all are lost it's game over.