UFO: Alien Invasion is a strategy video game in which the player fights aliens that are trying to take control of the Earth. The game was heavily influenced by the X-COM series, especially UFO: Enemy …

Monthly update for January, 2017 UI2: Fix title spacing on Main Menu. Split precache list to silence warning. Fix the actor fall event. Make actors fall when the func_breakable they're standing on is …

Sep 3, 2014 · UFO: Alien Invasion is a free, open-source game in the tradition of the original UFO: Enemy Unknown. Players must defend earth against an alien invasion by building bases around the …

To install UFO:AI via Mac Ports run the following command: Version 2.6-dev is the work in progress version. It is considered unstable. It is only officially available through Git. See how to get the source …

Sep 3, 2014 · UFO: Alien Invasion is a free, open-source game heavily inspired by the original UFO: Enemy Unknown or X-COM: UFO Defense in North America. It can be downloaded at the official …

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 …

Dec 30, 2025 · An unidentified flying object (UFO) is any aerial object or optical phenomenon not readily identifiable to the observer. UFOs became a major subject of interest following the development of …

UFO: Alien Invasion is a Quake II engine-based open source freeware strategy game that is effectively a direct remake of X-COM: UFO Defense, though it adds several new mechanics, changes up many of …

Please see the wiki for more information on how to compile the game and the gamedata. UFO:Alien Invasion. Contribute to ufoaiorg/ufoai development by creating an account on GitHub.

6 days ago · Filmmaker insists Vatican preparing for alien contact in 2026 UFO expert says he has been given 'rare access' to secret archives