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Half-Life

3 sites carry this tag.

UFO: Alien Invasion UFO: Alien Invasion- Includes news, screenshots, and a forum about a free game remake. [Open Source] UFO 2000 UFO 2000- A multiplayer remake of X-COM: UFO Defense for Windows. [Open Source] X-COM: UFO Defense X-COM: UFO Defense- Background information, cheats and forums.