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. This content requires the base game XCOM: Enemy Unknown on Steam in order to play. Key Features 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. Reviews “The best tactics game of the decade gets better” 9.5 out of 10 – EGM “Complex strategy and clever enemy AI provide a highly rewarding experience” 9.25 out of 10 – Game Informer “Enemy Within is an amazing expansion to a brilliant tactical game.”” 9 out of 10 – IGN System Requirements Windows MINIMUM: OS: Windows Vista or later Processor: 2 GHz Dual Core (Core 2 Duo 2.4 GHz or Athlon X2 2.7 GHz) CPU Memory: 2 GB RAM Graphics: 256 MB Video Memory NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater Hard Drive: 20 GB available space Sound Card: DirectX compatible sound card RECOMMENDED: OS: Windows 7 Processor: 2.4 GHz Quad Core CPU Memory: 4 GB RAM Graphics: 512MB Video Memory ATI Radeon HD 3000 Series/NVIDIA GeForce 9000 Series or greater Hard Drive: 20 GB available space Sound Card: DirectX compatible sound card Mac OS X MINIMUM: OS: OS X 10.7.5 (Lion), 10.8.5 (Mountain Lion) Processor: 2.0 GHz Intel Core 2 Duo (Dual-Core) Memory: 4 GB RAM Graphics: AMD HD4000 / NVIDIA 9000 Series Network: Broadband Internet connection Hard Drive: 24 GB available space Additional Notes: NOTICE: The following graphics cards are not supported: ATI X1xxx series, ATI HD2xxx series, Intel GMA series, NVIDIA 7xxx series, NVIDIA 8xxx series. The following cards require you to have 8GB of system RAM: NVIDIA 320M, NVIDIA 9400 and Intel HD3000. RECOMMENDED: OS: OS: 10.9 (Mavericks) Processor: 2.4 GHz Intel Core 2 Duo (Dual-Core) Memory: 8 GB RAM Graphics: AMD HD4000 / NVIDIA 9000 Series Network: Broadband Internet connection Hard Drive: 20 GB available space Additional Notes: NOTICE: The following graphics cards are not supported: ATI X1xxx series, ATI HD2xxx series, Intel GMA series, NVIDIA 7xxx series, NVIDIA 8xxx series. The following cards require you to have 8GB of system RAM: NVIDIA 320M, NVIDIA 9400 and Intel HD3000. SteamOS + Linux MINIMUM: OS: Ubuntu 14.04 (64 bit) Processor: 2 GHz Memory: 4 GB RAM Graphics: Nvidia 600 series+, AMD 6000 series+, Intel Iris Pro Hard Drive: 16 GB available space RECOMMENDED: OS: Ubuntu 14.04 (64 bit) Processor: 3 GHz Memory: 8 GB RAM Graphics: Nvidia 700 series+, AMD 6000 series+ Hard Drive: 16 GB available space