Hit as many falling, fast-moving targets as you can. Move your laser base to avoid being hit yourself. Keep shooting as long as your bases last, and try for a great Peak Score!

You start with 10 laser defense bases. Several things fall from the sky: rocks, spinning white bombs, "smart" guided missiles and - when your score goes over 20,000 - UFO bombs. If your active laser is hit OR a spinner lands, you lose that base. You get another base whenever your peak score goes up 1,000 points. As the score goes higher more targets appear - falling faster.

WHEN ALL BASES ARE LOST, THE GAME ENDS AND YOUR PEAK SCORE APPEARS.

(credit: Atari; direct excerpt from original game instruction manual)