Unreal Engine
The game was announced on May 9, 2005 as "Unreal Tournament 2007" for a 2006 release. In August 2006, the game was delayed until the first half of 2007. The game was renamed to "Unreal Tournament 3". The original "Unreal Tournament" uses the first Unreal Engine, while "UT2003" and "UT2004" use Unreal Engine 2. Since "2004" incorporates all of the content from "2003", they are regarded as part of the same generation. "UT3" is the third generation, as it runs on Unreal Engine 3 and does not reuse any content.