Defense Grid: The Awakening

Defense Grid: The Awakening is a tower defense video game developed by Hidden Path Entertainment for Windows and Xbox Live Arcade on the Xbox 360. The game was one of the titles promoted by Microsoft during their Game Developers Conference keynote speech on February 20, 2008. The game was released for Microsoft Windows on December 8, 2008, and for Xbox 360 on September 2, 2009. The OS X version shipped from Virtual Programming on July 7, 2010. Players must defend military bases from waves of attacking aliens by positioning a range of tower-based weaponry. New levels provided as downloadable content have been developed in the two years since the game's initial release.