XCOM: Enemy Unknown Complete Pack includes XCOM: Enemy Unknown and the following DLCs: XCOM: Enemy Within, XCOM: Enemy Unknown - Elite Soldier Pack, and XCOM: Enemy Unknown - Slingshot Pack.

From the makers of Sid Meier’s Civilization comes a game about civilization’s last stand. As the commander of an elite paramilitary organization known as XCOM, you control Earth’s defences against a terrifying alien invasion. This package includes the award-winning XCOM: Enemy Unknown and XCOM: Enemy Within expansion, plus all of the released add-on content.

XCOM: Enemy Unknown Features

• Strategic Base: Detect and intercept the alien threat as you build and expand your XCOM headquarters. Recruit, customize and develop unique operatives, manage your personnel, and negotiate with governments around the world.
• Tactical Combat: Direct your squad in fierce turn-based ground battles, engage in cover operation, and rescue civilians in crowded cities and desolate outlands around the world.
• Research Alien Technology: Recruit scientists and engineers to unlock more advanced weapons, armour and abilities.

XCOM: Enemy Within Features

• Additional Soldier Abilities: Research a new alien technology to advance the capabilities of your operatives at a genetic level using Gene Mods or engineer MEC suits for heavy support in the field.
• Additional Weapons and Equipment: Give your operatives an extra tactical edge with new projects from your engineering team and the Foundry.
• Additional Enemy Threats: Adopt new tactics to counter the threats from two new aliens, the Seeker and Mechtoid, and a new human enemy known as EXALT.
• New Strategic Resource: A valuable new alien resource, known as MELD, has been released onto the landscape providing access to new research and upgrades.