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Like its predecessors, Quake and Quake II, Quake III Arena can be heavily modified, allowing the engine to be used for many different games.

Mods range from small gameplay adjustments like Rocket Arena 3 and Orange Smoothie Productions to total conversions such as Smokin ' Guns, Loki's Revenge and DeFRaG.

The source code's release has allowed total conversion mods such as Tremulous, World of Padman, OpenArena and Urban Terror to evolve into standalone free games.

Other mods like Weapons Factory Arena have moved to more modern commercial engines.

Challenge ProMode Arena became the primary competitive mod for Quake III since the Cyberathlete Professional League announced CPMA as its basis for competition.

CPMA includes alternative gameplays, including air-control, rebalanced weapons, instant weapon switching and additional jumping techniques.