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Developer website: ufoai.sourceforge.net
UFO: Alien Invasion is a squad-based tactical strategy game in the tradition of the old X-COM PC games, but with a twist. Our game combines military realism with hard science-fiction and the weirdness of an alien invasion. The carefully constructed turn-based system gives you pin-point control of your squad while maintaining a sense of pace and danger.

What's New

Version 2.4:
  • A dozen new maps to battle aliens
  • Rescue soldiers in dropships shot down by aliens and retreat from battles
  • New particle and sound effects for weapons
  • Support for smoke and incendiary effects
  • New skirmish options to save squads and respawn aliens
  • Battlescape render speed dramatically improved
  • Much more...


Mac OS X 10.4.7 or later

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UFO: Alien Invasion User Discussion

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Redmelons Member IconComment+3

Is this download 64 bit only? Not supported on my 32 bit Core Duo

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Version 2.4
Jvdbroek Member IconComment+1

UFO game crash on my Macpro and if i want to start the screen is detroyed with bad grapichs moire. Not to play i have it delete fast.

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Version 2.3
gn0s1s Member IconReview+2

On a Mac, the gameplay is smooth. I lost many years of my life to the 3 X-Com games back when I was a PC user (and young). This game does do justice to those wonderful games, kudos to the developers. There are some things to look out for, however... - Multiplayer doesn't seem to find servers on the internet - Some text (English) for the game is just filled with the phrase "TODO" meaning they haven't gotten to it yet. This includes the first two man-made fighters based on Alien Tech, and a mid-game scrolling text to further the story along. - There are bugs, like the imagery of your soldiers in fighting mode don't reflect the soldier currently selected. I also don't know if it is me, but the Standard mode feels too easy. I find myself building bases just to waste all of the loads of cash I am given, and there is very little alien fighting. I am a huge veteran of the games, I worshipped them and was an expert, so maybe I am biased, but who knows. This UFO:AI game, in spite of the above, has consumed me again. I'm older now, and it brought back good memories and an old addiction. It is a version 2.2, which means it has a LOT of stability and great development. The graphics are good, and so is the AI.

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Version 2.2
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Current Version (2.x)


Downloads 8,742
Version Downloads 1,370
License Free
Date 25 Apr 2012
Platform OS X / Intel 32
Price Free