The PlayStation Vita version is only available bundled with Enemy Unknown under the title, XCOM: Enemy Unknown Plus. The iOS and Android versions were released as stand-alone apps not requiring the original mobile port of Enemy Unknown to play. The Windows, OS X and Linux editions require XCOM: Enemy Unknown to play Enemy Within was released for Xbox 360 and PlayStation 3 as part of the Commander Edition bundle with Enemy Unknown. On March 22, 2016, the game was released on the PlayStation Store for PlayStation Vita. The game also came to the iOS App Store and Google Play Store a year after the initial release, on November 12, 2014. In June 2014, Feral released both XCOM: Enemy Within and its base game XCOM: Enemy Unknown for Linux. XCOM: Enemy Within was released for Microsoft Windows, PlayStation 3, and Xbox 360 in November 2013. The expansion pack primarily adds new gameplay elements to the base game, as well as introducing new themes of transhumanism via aggressive gene therapy.
XCOM: Enemy Within is an expansion pack for the turn-based tactical video game XCOM: Enemy Unknown.
