To jumpstart your score, avoid shooting anything until the asteroid appears (usually about 15 to 20 seconds into each wave). Since aliens get more hostile over time, this only works well for the first few non-formation waves.

The game has only 16 distinct waves. Once you pass the 16th wave, they will repeat, starting over with wave 1 (the aliens, however, remain very hostile).

The score rolls over at 1 million.

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