The game is set in 1962 at the height of the Cold War and tells the origin story of the XCOM organization's first encounter with a mysterious and devastating enemy. Turn-based games have a thin line to walk in order to keep players engaged. XCOM: Enemy Unknown pulls players in so many different directions with both threats and opportunities that making the tough choices it demands is as difficult as stepping away from the nail-biting situation onscreen. Defending against XCOM’s mysterious alien invasion is one of the most challenging, intense gaming experiences of this generation. Preventing Earth from succumbing to invading extraterrestrials takes place in two phases. In the strategic view, you must manage limited time, money, and material resources.