From Epic Games:
Unreal Tournament 2004 is a multiplayer first-person shooter that combines the kill-or-be-killed experience of gladiatorial combat with cutting-edge technology. Ten game modes, both team-based and "every man for himself," provide even the most hard-core gamer with palm-sweating challenges through unbelievably detailed indoor arenas and vast outdoor environments. As the ultimate techno-gladiators of the future, players will take their fates into their hands, battling up to 32 other players online in action-packed, frag-filled arenas.
Unreal Tournament 2004 features two new game modes, the large-scale Onslaught, a team-based challenge that features two teams using air and land vehicles to overrun each other's front lines, and a completely redesigned Assault, wherein gamers are challenged to attack or defend bases. Classics such as Deathmatch, Capture the Flag, and Bombing run on five new maps: ONS-Torlan, AS-Convoy, DM-Rankin, CTF-BridgeofFate, and BR-Colossus.