Defense Grid: The Awakening is a strategy game designed to be the definitive tower defense game experience designed specifically for Xbox LIVE Arcade. Multiple levels: The game features 20 story levels with four bonus Borderlands levels with new terrain, unique placement of roads, platforms, obstacles, tower build locations, and open areas for you to plan your strategy. There's also 100 interesting challenge modes with unique situations and objectives that may alter your strategies.
Tons of play: There are 10 hours of story-driven play with dozens of hours and more of challenge mode play.