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UFO2000 is a free and opensource turn based tactical squad simulation multiplayer game, heavily inspired by the famous UFO: Enemy Unknown and providing a very similar reimplementation of its tactical part.

Currently UFO2000 has its own basic set of fan-made graphics which is included in UFO2000 distribution by default . But those who also have a copy of UFO: Enemy Unknown game (there are plenty of places to buy it nowadays), have the possibility to use the original graphics from it for extending UFO2000 with additional maps, weapon sets and units.