On a level that is not a fully enclosed shape, you can often sit at one of the far ends, and when an approaching enemy is right next to you, hold down your fire button, and they will be destroyed. In the test mode, you can zero the high score table and examine the game parameters, but not modify them. Scores beyond 999999 are not possible, as the score will roll-over to 000000. Description You are given a vanishing-point perspective from the top, looking down into a geometric shape. The shapes vary from a line, to a triangle, to a circle, to more complex shapes.
Enemies enter from the bottom and work their way up towards the top.
Collision with an enemy or an enemy's shot is fatal. A level is cleared when all the enemies have been destroyed, or the only enemies left are the red shooters that have reached the top of the tunnel. When proceeding to the next level, shoot and destroy, or avoid, the green spikes that are left over, as a collision with them is fatal. The superzapper will destroy all the enemies on screen the first time it is used. The second time has a much more limited effect.