Classic strategy game X-COM: UFO Defense free

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Hi, if you’ve got a Steam account, the Humble Store has the original X-COM game available for free for a day or so: https://www.humblebundle.com/store/xcom-ufo-defense-free-game
You’ll need a Steam account to redeem the key, and the key itself must be redeemed by Feb 15th, or it will expire.

In case you haven’t played X-Com before, it’s a tactical strategy game where you play the role of the X-COM task force that is investigating and defending against alien incursions all over the globe. Depending on how well you do, the various countries of the world will decide to keep funding you or not.
You’ll need to build & staff bases, track the UFOs, intercept them, and if they land, engage and take them out.
Alien encounters are turn-based squad combat.
Do well enough and understand the aliens well enough, and you can take the fight to them!

Any Windows machine can play this- Mac & Linux users should be able to play this as it’s using DOSBOX to run the game itself, you’ll just have to point your copy of DOSBOX to the game’s files.