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The 1994 original X-Com: UFO Defense / UFO: Enemy Unknown is currently free on Humble:

You need a Humble account and will get a Steam key. The offer ends in roughly 24 hours and the key needs to be redeemed in the next two weeks or so (Only on, it doesn't need to be activated on Steam).

If this is your first time playing, it is highly recommended to use OpenXcom:

And it's over!
Post edited February 01, 2017 by Syrion