A scout ship from the war that was recently discovered floating in space is put back into service. You, the pilot, are charged with destroying the larger asteroids heading for Earth, and with finding the cause for this Asteroid Storm.

Different coloured balls appear at the top of the screen, and drop one by one into the play area. Form clusters of three of the same colour to create a reaction. Balls supported by them will then roll, tumble and bounce realistically around the play area until they fall into place.