App DescriptionThe invaders struck without warning! Defend your world against an alien onslaught spanning a dozen battle zones across several days of combat, each more difficult than the one before. With a complete arsenal of towers to build and upgrade, you must shape the invaders’ paths across the battle grid and eliminate them before they reach the containment zone.
7 troop types
9 upgradeable towers
5 unique maps
full multi-touch controls
January 01, 2013 Initial Release