XCOM: Enemy Within Steam

NOTICE: Activation key must
be used on a valid Steam account. Requires an internet
connection.

XCOM®: Enemy Within is the
expansion to the 2012 Game of the Year award-winning strategy game
XCOM: Enemy Unknown. 

Enemy Within adds an
incredible array of new abilities, upgrades and weapons to combat
new enemy and alien threats. This expansion also introduces new
maps and missions, new tactical and strategic gameplay, and new
multiplayer content providing a fresh new gameplay experience.

• New Soldier Abilities:
  Construct the Genetics Lab to physically enhance your operatives’
  abilities including augmentations to the chest, brain, eyes, skin,
  and legs or build the Cybernetics Lab to enable the construction of
  the new Mechanized Exoskeletal Cybersuit, or MEC. The new MEC
  Trooper class has specialized abilities and each suit can be
  upgraded with new weapons including the flamethrower and grenade
  launcher.
• New Weapons and
  Equipment: Give your operatives an extra tactical edge with
  new projects from your engineering team and the Foundry.
• New Enemy Threats:
  Adopt new tactics to counter the threats from two new alien types
  and a deadly new organization known as EXALT.
• New Strategic Resource:
  A valuable new alien resource, known as Meld, has been discovered.
  Secure it on the battlefield and use it carefully back at base to
  unlock new research and upgrades.
• New Tactical Challenges and
  Maps: Cloak-and-dagger and intelligence operations provide
  new tactical challenges on over 40 new battlefields.
• New Multiplayer maps, units,
  and abilities: Create your custom squad from a wider array
  of options and dominate your opponent in intense, one-on-one,
  turn-based matches.

System requirements