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You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.

X-Com : UFO Defense

You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.

- Command deadly close-combat battles

Shooting down UFOs is just the beginning: you must then lead a squad of heavily-armed soldiers across different terrains as they investigate the UFO crash site. Tackle the aliens with automatic rifles, rocket launchers, and 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 to analyze alien items. Each new breakthrough brings you a little closer to understanding the technology and culture of the alien races. Once you have sufficient research data on the UFO's superior weapons and crafts, you'll be able to manufacture 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'll also need to watch the world political situation: governments may be forced into secret pacts with the aliens and then begin to reduce X-COM funding.

Minimum Requirements:

Supported OS:Microsoft® 2000/XP/Vista®
Processor:80386 processor or better
Memory:4Mb RAM
Sound Cards Supported:AdLib compatible cards, SoundBlaster compatible cards and the Roland LAPC-1.

To activate the Steam key you've received, follow the instructions below;

First up, open the Steam client. (If you don't have it, simply click the "Install Steam" button here => Steam Store )
Sign in to your Steam account. (If you don't have one, click here to create a new one => Steam Account)
Click on the "ADD A GAME" button in the bottom corner of the client.
Then, select "Activate a product on Steam..."
Write down or copy-paste the activation key that you've received from %s in the window.
Your game is now visible in your library! Click on your "Library".
And finally, click on the game and select "Install" to start your download.