Activision today announced that the Xbox 360 version of Quake IV has shipped to retailers across the US. In Quake IV, you are Matthew Kane, an elite member of Rhino Squad and Earth's valiant invasion force. Fight alone, with your squad, and in hover tanks and mechanized walkers as you engage in a heroic mission into the heart of the Strogg war machine. But, in this epic war between worlds, the only way to defeat the Strogg is to become one of them. Battle through early missions as a deadly marine, then after your capture as a marine-turned-Strogg with enhanced abilities and the power to turn the tide of the war. Quake IV has been re-engineered exclusively for Xbox 360 and includes the entire single player campaign in addition to 2-4 player co-op and 2-8 player multiplayer via System Link or split-screen.