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Universe at War: Earth Assault is a real time strategy game developed by Petroglyph and published by Sega for the Xbox 360 and Windows PC, and was available on Steam until 2014. The game features an online multiplayer mode which allows Xbox 360 version players to play against PC version players.
Universe at War is set in the near future, when an alien race invades Earth to plunder its resources. A second alien race attacks the first, and this is the premise for the game.