Defense Grid

Defense Grid: The Awakening is a tower defense videogame developed by Hidden Path Entertainment for Windows and Xbox Live Arcade on the Xbox 360. 

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.

Defense Grid 2 is a 2014 tower defense videogame developed by Hidden Path Entertainment and published by 505 Games. The game was crowd-funded on Kickstarter in 2012, and released on Windows, Xbox One, and PlayStation 4 on September 23, 2014. Linux and OS X versions were released on October 15, 2014.