UFO: Alien Invasion is an entirely free and open-source game inspired by the X-COM video game series.
The year is 2084, and you control a secret organization tasked with defending Earth from an alien invasion. To do this, you'll need to build bases, train your team, research new technologies, and battle the aliens who have landed on our planet.
The game is a turn-based tactical strategy. There are two main modes: in the Geoscape mode, you control the base, vehicles, engineering, and scientific departments. In the Tactical mode, you control the team of soldiers tasked with seeking out and destroying the aliens. By defeating UFOs, you gain access to new technologies that are useful for building weapons or devices to use against the enemy. Alien Invasion also supports multiplayer mode, allowing you to play against other players.
While heavily inspired by UFO: Enemy Unknown and X-COM: Terror from the Deep, UFO: Alien Invasion is not a remake but an attempt to enhance and expand upon the original game.
Download for PC 