XCOM: Enemy Unknown is a turn-based tactical strategy game developed by Firaxis Games and released in 2012. The game reimagines the classic X-COM series, placing players in command of an elite global defense organization fighting a mysterious alien invasion. Players manage base facilities, research alien technology, train soldiers, and engage in intense grid-based combat missions worldwide. Strategic decisions affect funding from member nations and the survival of humanity. With deep customization, permanent soldier death, and challenging tactical gameplay, it delivers a rewarding and strategic sci-fi experience.