FREE: X-COM: UFO Defense [steam key]

The listing, X-COM: UFO Defense [steam key] has ended.

http://store.steampowered.com/app/7760/

You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.
Main features:
Control a battle in melee mode
Shooting down UFOs is just the beginning: you must then lead a squad of heavily-armed soldiers across different places of the UFO crash. Tackle the aliens with automatic rifles, rocket launchers or even tanks in the struggle to retrieve useful technology, weapons or life forms.
Research and manufacture alien technologies
Successful ground assault missions will allow X-COM scientists will allow to analyze alien items. Each new breakthrough brings you a step closer to understanding the technology and culture of alien races. If you have sufficient research data on the UFO's superior weapons and crafts, you can produce weapons of equal capability.
Develop a strategy to save the Earth
You must make every crucial decision as you combat the powerful alien forces. But you also have to look at the political situation in the world: governments may be forced into secret pacts with the aliens and begin to cut funding for X-COM.