Shoot every asteroid whose number is a factor of the number at the top. Each factor appears only once.
Target numbers range from 1 through 50. The other asteroids contain unique non-factors.
Correct factors increase your score and streak. Larger numbers appear on proportionally larger asteroids. Asteroids can bump into each other like billiard balls.
Yellow S orbs add 20% shield. Asteroid collisions bounce the ship away and reduce shield by 10%.
If your shield is already gone and you collide again, explode.gif appears over the ship and the ship explodes.
The mission lasts 10 rounds. Sounds use bgmusic.mp3, laser.mp3, explode.mp3, gameover.mp3, and victory.mp3. Correct answers play goodhit.mp3. Shielded collisions play bounce.mp3. Shield orb collisions play powerup.mp3. Wrong answers display wronganswer.jpg and play wronganswer.mp3.