Description:
It is your duty, as the commander of the country's anti-air defense, to eliminate recurrent enemy balloon attacks. You may erect buildings to toughen your defenses, appeal to increasingly costly air raids, or use your sluggish cannon in the battle.

Instructions:
Press the left-mouse button to fire your cannon after aiming with your mouse; press '1', '2' or '3' to request air raids; and '4' to '9' to assemble buildings. Alternatively, you may click the icons on the screen to demand air raids or construct defenses. Let's battle!