geoDefense is a 2008 tower defense game created for iOS devices developed by American studio Critical Thought Games. A sequel, geoDefense Swarm, was released on September 14, 2009, and was listed by Time magazine as one of the best games of the year. An Xbox Live enabled version was released for Windows Phone on June 8, 2011. As of the release of iPhone iOS 11, the game was removed from the App Store because of incompatibility.