XCOM: Enemy Unknown

XCOM: Enemy Unknown

XCOM: Enemy Unknown is a turn-based tactical video game, developed by Firaxis Games, a remake of the 1994 classic strategy game UFO: Enemy Unknown (aka X-COM: UFO Defense)

Minimum system requirements: 

OS: Ubuntu 14.04 (64 bit)
Processor: 2GHz
Memory: 4GB Memory
Graphics: 512MB
Hard Drive:16GB HD space
Other Requirements: Nvidia 600 series+, AMD 6000 series+, Intel Iris Pro

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