The game has two screens. When it begins, a female voice welcomes you as the commander of the star ship. You have three star bases to defend while alien ships surround you. Then you choose a space sector where you enter in to the battle section.
Your ship has 5 systems (Battle Computer, Impulse Drive, Hyper Drive, Tracking Computer and Shields): if your ship is hit you can repair the damage at a star base. Repairs during battles are allowed, but they are slower, use ship's energy and can't repair destroyed ship systems. The game ends when you run out of energy and/or your ship is destroyed. The ship is destroyed when all the systems are destroyed, or if Hyper Drive blows the ship up (50% chance of this occurring if you use Hyper Drive when destroyed).