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UFO: Alien Invasion is a futuristic, squad-based and turn-based strategy game set in 2084, heavily inspired by X-COM, but not a sequel or a remake. The game uses a heavily modified version of the Quake II engine. The player controls the secret organization PHALANX and has to construct bases around the globe, and hire soldiers, workers and scientists to fight off an alien invasion. Base construction and the tracking of alien threats takes place on a world map (Geoscape mode), and the fighting is turn-based and done on a 3D map where the player controls a squad of soldiers (Tactical mode). Major tasks include protecting civilians, and capturing aliens and their technology in order to get money and better weapons.

Multiplayer is supported over LAN and internet, with head-to-head sessions, but also cooperative games with a maximum of 6 teams playing, against each other, or AI-controlled opponents. The game is free software, licensed under the GNU General Public License.


UFO: Alien Invasion Windows The world map and an alien attack on Europe
UFO: Alien Invasion Windows My dropship is returning home after a successful mission.
UFO: Alien Invasion Windows Arming one interceptor
UFO: Alien Invasion Windows Air battle

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Alternate Titles

  • "UFO:AI" -- Abbreviated version

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Critic Reviews Jul 27, 2010 5 Stars5 Stars5 Stars5 Stars5 Stars 100 May 29, 2006 91 out of 100 91
Plné Hry May 23, 2008 90 out of 100 90
Softonic Mar 25, 2008 4.5 Stars4.5 Stars4.5 Stars4.5 Stars4.5 Stars 90
Clubic Jul 20, 2010 4 Stars4 Stars4 Stars4 Stars4 Stars 80


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Joel Segerbäck (665) added UFO: Alien Invasion (Windows) on Jun 16, 2007
Other platforms contributed by Sciere (507749) and Joel Segerbäck (665)