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********** We spend several weeks to upgrade this game to our latest engine to fit all iOS devices and support new features. We also improve the graphics and add some new features. Enjoy! ********** HeliInvasion - Survive waves of invading hostile helicopters! Shoot them with your cannon, rocket, rock, wind, and try to make them rotate until they explode. Let them knock into each other to create massive chain reactions of explosions! Earn money with each exploding helicopter to repair and upgrade your cannon. -Support Multi touch after getting double shell. -Compete with your friends through online Leaderboard via the GameCenter system! -Upgrade weapons`s rate of fire and amount. -Using box2d physical engine to simulate the collision, flying,exploding. -Support ipad, iphone and ipod touch. GameCenter enabled. Follow us: http://www.facebook.com/tophotapp http://www.twitter.com/tophotapp More games: www.3g60.com www.tophotapp.com Enjoy it!