Unreal Tournament 3 is the fourth game in the Unreal Tournament series and the eighth Unreal game, but it has been numbered in terms of the engine it runs on. The original Unreal Tournament uses the original Unreal Engine, while UT2003 and UT2004 use the Unreal Engine 2, and 2004 incorporates all of the content from 2003; therefore they are considered as the same generation. UT3 is subsequently part of the third generation, because it runs on the Unreal Engine 3, and does not reuse any content. In March 2008, Midway announced that UT3 had sold over a million copies worldwide.