You buy official game key XCOM: Enemy Unknown - The Complete Edition from 2K

Release date - 07.03.2014
Regional restrictions - for use in Russia and CIS countries
Editorial - The standard version does not contain additional content

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ATTENTION !!!
- This key is activated via Steam

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XCOM: Enemy Unknown

XCOM: Enemy Unknown will place you in control of a secret paramilitary organization called XCOM.
As the XCOM commander, you will defend against a terrifying global alien invasion by managing resources, advancing technologies, and overseeing combat strategies and individual unit tactics.
The original XCOM is widely regarded as one of the best games ever made and has now been re-imagined by the strategy experts at Firaxis Games.
XCOM: Enemy Unknown will expand on that legacy with an entirely new invasion story, enemies and technologies to fight aliens and defend Earth.
You will control the fate of the human race through researching alien technologies, creating and managing a fully operational base, planning combat missions and controlling soldier movement in battle.

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* INSTALLATION:
- Download and install Steam - http://steampowered.com/download/SteamInstall.msi
- Register your Steam account
- Go to the "Games" and select "Activate via Steam"
- Enter the activation key
- After that, the game will appear in the list and you can download XCOM: Enemy Unknown - The Complete Edition