The UT2004 Editor ("UEd3") must not be confused with the third generation Unreal Engine ("UE3"), which powers UT3, UDK, and many other games of the last few years. UT2004 is powered by the second generation Unreal Engine ("UE2"), which in turn must not be confused with the Unreal Editor 2 ("UEd2"), that comes with many of the later first generation Unreal Engine games.