Classic arcade game. Simple and Fun.
Click in front of the rocket to destroy it.
Remember that it will take some time for the defensive rocket to reach its target location and destroy an enemy missile.
In the upper left corner you will see how many enemy rockets you have to destroy at this level and how many defensive rockets you have left. If you run out of rockets, you have to wait until the attack is over and hope that the enemy will not destroy the whole city.
The infinite number of levels and cool music guarantee great fun for many hours.