Fly your star cruiser through each cavern while avoiding the various obstacles. Reach the goal of each cavern to ascend to the next cavern.

Avoid running out of fuel or shield energy. Crashing into some obstacles simply depletes your shield energy while other obstacles instantly destroy you. Some barriers and enemies can be destroyed using your missiles.

Touch the save points so that if you crash, you can restart from the last save point. Write down the level code from each save point so if you restart the game you may continue from the last save point.