Defense Grid: The Awakening is the definitive Tower Defense Strategy game that's easy to pick up, engrossing to play, and hard to set down. Strategically place your towers on the map to prevent alien enemies from stealing your power cores. Play just for fifteen minutes or several hours! This award winning game includes 8 hours of story play with 20 unique maps, a wide variety of tower and enemy types, an interactive soundtrack, plus 60 unlockable challenge modes adding dozens of hours of additional fun. Protect the Cores!