The goal is to protect your bases from the attacking missiles. Each base can shoot at the enemy missiles, but don't waste your missiles because each base contains only 9. When a base is destroyed, it's missiles are not replenished for the next attack. You must the front (head) of the incoming missile to destroy it. Each phase of the attack either contains more enemy missiles or the missiles are faster, or both. 
You can move the target in all directions by using the control pad.  Use the Fire button to fire a missile.

Scoring:
The sooner you destroy an incoming missile, the more points you receive.
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