High Quality Content by WIKIPEDIA articles! XCOM: Enemy Unknown is a turn-based tactical role-playing strategy video game developed by Firaxis Games for publisher 2K Games, released on October 9, 2012 in North America and three days later in Europe and Australia for Microsoft Windows, PlayStation 3 and Xbox 360. The game is a "reimagined" remake of the 1994 cult classic strategy game UFO: Enemy Unknown (also known as X-COM: UFO Defense).