XCOM: Enemy Unknown XCOM: Enemy Within

XCOM: Enemy Within is an expansion to XCOM: Enemy Unknown that adds new abilities, upgrades, weapons, enemy threats, maps, missions and multiplayer content. You command operatives in tactical battles and make strategic decisions at base, where you can unlock research and upgrades.

Enhance your operatives

Build a Genetics Lab to physically enhance operatives, with augmentations for the chest, brain, eyes, skin and legs. Alternatively, construct a Cybernetics Lab to build Mechanized Exoskeletal Cybersuits (MECs). The new MEC Trooper class has specialized abilities, and each suit can be upgraded with weapons including a flamethrower and grenade launcher. New projects from the engineering team and the Foundry provide additional weapons and equipment.

New threats and resources

Two new alien types and a deadly organization called EXALT introduce new threats to counter with different tactics. You can also secure Meld, a valuable alien resource, on the battlefield and use it carefully at base to unlock research and upgrades.

Missions and multiplayer

Cloak-and-dagger and intelligence operations add tactical challenges across more than 40 new battlefields, alongside new maps and missions. Multiplayer adds maps, units and abilities for building a custom squad and competing in one-on-one, turn-based matches.