"UFO: Enemy Unknown," also known as "X-COM: UFO Defense" in North America, is a tactical strategy video game released in 1994. Players manage a global defense organization called "X-COM" to combat alien invasions. The game combines resource management, research, and turn-based combat, allowing players to develop technology and engage in battles against extraterrestrial foes. The gameplay involves two main components: base management and tactical missions. Players build and upgrade bases, recruit soldiers, and research alien technology. During tactical missions, players control their units in grid-based combat, making strategic decisions to defeat alien forces and protect Earth from the impending threat.