XCOM: Enemy Within is the standalone expansion to the 2012 Game of the Year award-winning strategy game XCOM: Enemy Unknown. Enemy Within adds an incredible array of new abilities, upgrades and weapons to combat new enemy and alien threats. This expansion also introduces new maps and missions, new tactical and strategic gameplay, and new multiplayer content providing a fresh new gameplay experience. XCOM: Enemy Within includes the Elite Soldier Pack, Slingshot, and Second Wave add-on content.