Earth has become an intergalactic battleground for three warring alien factions in Universe at War: Earth Assault, the new real-time strategy game from Petroglyph, the developers of last year?s Star Wars: Empire at War. Each of the game?s factions will play in a totally different manner from each other, with their own resource model, units, and abilities. The game?s customization system, Tactical Dynamics, gives players further control by letting them change units on-the-fly to overcome any challenge. Universe at War: Earth Assault will be the first third-party title to support Microsoft?s new Games for Windows ? Live system, allowing PC players to compete head to head against their Xbox 360 counterparts. Universe at War: Earth Assault will be DirectX?9 and DirectX?10 compatible, and will run on both Windows XP? and Windows Vista?.