- You can only shoot the aliens
- Hold the space bar down for continuous fire
- The faster you clear a screen the faster the game progresses
- The time bar shows the time left: green=big bonus & red=big fine
- Bar also indicates whether a red mother ship is expected soon
- Hit red motherships and choose either an extra life, a better weapon or shields
- The evil green mother ships need to be shot many times to kill
- Remember to use your shields when you get trapped
- Don't chase after the aliens or you'll get shot
- The more you think the higher you'll score
- Scores over 20000 get on high score list
- Try not to get trapped in the corners
- Don't shoot NASA equipment
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