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Unreal Tournament was launched in direct competition to Quake III Arena, and was similarly focused on multiplayer action. UT improved upon the mod-friendly nature of its predecessor with the inclusion of support for "mutators", which allowed users to selectively insert game code modifications without the need for a total conversion. Small mods, such as ones adding weapons or power-ups, could be seamlessly combined according to the player's desires. Players could then use a simple dialog box to enable or disable the mutator.

The major addition to Unreal Tournament 2004 is the introduction of vehicles along with the Onslaught game type, allowing for larger scale battles. Besides introducing new weapons, vehicles and game types, Unreal Tournament 2004 also contains everything released previously in Unreal Tournament 2003. Consequently, Unreal Tournament 2004 completely replaced Unreal Tournament 2003 on store shelves.

Unreal Tournament 3 is actually 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.