Your defense skills are needed to protect your city from incoming bombers. As planes and helicopters fly by, they'll be dropping bombs on your precious land. Drive in your vehicle below, armed with missiles of your own, and attack the enemies above by double tapping on your screen. Avoid enemy fire by moving your tank back and forth with your finger.
Last as long as you can in this frantic firestorm. Be careful though--the more enemies you defeat, the more difficult their replacements prove to be.
Compete with players around the world by trying to make the top 10 high score list.