X-Com Enemy Unknown

X-COM: Enemy Unknown is a turn-based strategy game set in an alternate universe where aliens have invaded Earth. Players take on the role of a commander tasked with leading a team of soldiers to defeat the alien threat and uncover the secrets behind their invasion.

The gameplay involves tactical battles against the alien forces, using a variety of units such as infantry, snipers, and heavy guns. As players progress through the game, they must manage resources, recruit new troops, and develop new technologies to stay ahead of the enemy. The ultimate goal is to save humanity from extinction.