Unreal Engine 2 - 2004

Unreal Engine 2 is a game engine developed by Epic Games, first used in Unreal Tournament 2k3.
unreal
↓
Unreal Engine 2
Unreal Tournament 2003 - 2002
Postal 2 - 2003
Deus Ex: Invisible War - 2003
Unreal Tournament 2004 - 2004
↓
Unreal Engine 3 (2007)