Unreal Tournament 2004, also known as UT2K4 and UT2004, is a futuristic first-person shooter computer game developed by Epic Games and Digital Extremes. It is part of the Unreal series of games and is the sequel to 2002's Unreal Tournament 2003 and the original Unreal Tournament.
Among significant changes to gameplay mechanics and visual presentation, one of the major additions introduced by Unreal Tournament 2004 is the inclusion of vehicles and the Onslaught game type, allowing for large-scale battles.
The game features all or most of the content of its predecessor, replacing it on the shop shelves. Unreal Tournament 2004 boxes sold in the United States include a $10 mail-in rebate requiring that a short form be completed and sent to the publisher along with a copy of the manual cover for Unreal Tournament 2003. Versions sold in the United Kingdom had a similar offer, but required sending in the play CD for Unreal Tournament 2003 instead.
Its successor, Unreal Tournament 3, was released on 19 November 2007.
UT2004 was built upon the "Ion Storm" engine and content of its predecessor, UT2003, addressing most its shortcomings, and overall features more than twice the combined content of the previous game.
Unreal Tournament 2004 was developed by multiple studios, with Epic games leading the project. Lead programmer Steve Polge described the role of each company involved:
Epic Games: Enhancements to the Unreal Tournament 2003 game types, the new UI, Voice over IP and bot voice command support, engine enhancements and optimizations. They also made an improved single player game, and improved community and demo recording support, in addition to thirty-one new playable characters. A Sniper Rifle similar to the one included in the original Unreal Tournament was added. They created one Onslaught map, and developed AI support for Onslaught. 16 new DM maps, 5 new CTF Maps, 2 new Double Domination maps and 1 new Bombing Run map were added. The Assault gametype design and implementation were also reintroduced from the original Unreal Tournament.
Psyonix: The Onslaught gametype design and implementation, with 6 new vehicles, 4 new weapons (Grenade Launcher, Spider Mine Layer, Anti-Vehicular Rocket Launcher (AVRiL), and the Phoenix target painter), and the Energy Turret. They also created seven Onslaught maps, and collaborated with Streamline Studios on the popular map ONS-Torlan. Finally, they made the new model for the Translocator.
Digital Extremes: 3 new DM maps, 6 new CTF maps, 2 new Bombing Run maps, and 3 new Double Domination maps, 2 new playable characters, the new HUD design; new weapon models for the Assault Rifle, Shock Rifle, and Link Gun.
Streamline Studios: The single player introduction movie and ONS-Torlan in collaboration with Psyonix. Later made an Assault map called AS-Confexia, downloadable from the Internet.
Unreal Tournament 2004 would be the first closed source game to support the new x86-64-bit extension, utilizing Linux, as Windows for x86-64 had not been released at the time.