XCOM: Enemy Unknown Complete Edition Includes XCOM: Enemy Unknown, XCOM: Enemy Within, Elite Soldier Pack add-on content, Slingshot add-on content, Second Wave add-on content Strategic Base: Detect and intercept the alien threat as you build and expand your XCOM headquarters. Recruit, customize and develop unique operatives, manage your personnel, and negotiate with governments around the world Tactical Combat: Direct your squad in fierce turn-based ground battles, engage in covert operations, and rescue civilians in crowded cities and desolate outlands around the globe Research Alien Technology: Recruit scientists and engineers to unlock more advanced weapons, armor and abilities Multiplayer: Mix and match aliens and humans, and combine abilities to outsmart and overpower your opponent in intense, one-on-one, turn-based matches