Novas appear randomly during the first 30 seconds of a stage and the shock wave of their explosion shakes the whole scenery for some seconds during which normal motion of objects is interrupted. The explosion destroys all existing normal asteroids and thereby often leads to a dangerous lot of fast moving smaller asteroids. Shooting the star in time before the explosion gives 1000 points and prevents the shock wave. Breaking up all bigger asteroids before a shock wave quickly leads to the end of the stage...

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