"Over 1.2 million copies of UT3 have sold on the PS3 and PC", says Mark Rein, vice president of Epic Games, a Cheshire cat smile beaming across his child-like face. He certainly has reason to be happy. He's in Vegas, or Sin City as some prefer to call it, for a start. And he has the world's assembled gaming press hanging on his every word, too. But, most importantly of all, his smile, his buoyant mood, is because he knows that he's got perhaps the definitive version of Unreal Tournament 3 on his hands. And it's on Microsoft's Xbox 360.