An elite group of soldiers , scientists and engineers from all over the globe is tasked with repelling the aliens and restoring peace to our planet . ` ` XCOM : Enemy Unknown '' ' resource management and combat strategy . Strategy - based gameplay is from Sid Meier 's Firaxis series . Designer says the elements are lacking by themselves . The game was released only in North America .
` ` XCOM : Enemy Unknown '' ' resource management and combat strategy . Strategy - based gameplay is from Sid Meier 's Firaxis series . Designer says the elements are lacking by themselves . The game was released only in North America .