Sentinel 2: Earth Defense, one of the best tower defense games for iOS devices like the iPhone 4 and iPod touch, is FREE for a limited time at the App Store.
Sentinel 2: Earth Defense expands upon the acclaimed gameplay of Sentinel: Mars Defense. The action takes place across varied, lushly rendered Earth environments, and the alien assault force has grown more vicious than ever. Luckily, human turret technology has also advanced, and the ship weapons system provides a spectacular new way to eradicate invaders!
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