No need to worry about trigger-finger fatigue. Just hold down the buttons for repeat weapons fire. Find the hidden Sol Citadels, silo-like structures, to score big points. Special flags are also hidden in the game to give you an extra life. If you progress through at least 70% of a given area and lose your ship, you'll start at the beginning of the next area. If you don't make it far enough, you'll have to start over at the beginning of the area.Special Features:Two players alternating; save high scores; vertical-scrolling shooting action.