Much like the Battlefield series, Quake III's sole value comes from facing human players online, not the single player campaign. The multiplayer modes are divided up into four types: free-for-all, team deathmatch, capture the flag, and tournament. Free-for-all and Team Deathmatch have the same goal of racking up the most kills. The only difference is that free-for-all is done so that all players fight each other and teams score for one group. Capture the flag is the only mode where fragging your opponent isn't the only way to win, which provides some variety to the matches.
Tournament mode is a good option when participating in or setting up competitions for Quake III. The game automatically pits players against each other and forms a bracket-like setup for the winners and losers. Each player goes one-on-one with each other with a time or score goal.
The weapons are well-balanced, though there are only a few available. The guns include the shotgun, machine gun, plasma rifle, rocket launcher, rail gun, lightning gun, and BFG. Each gun has specific recoil and damage rate which does not always place one gun over the other, save for the BFG. For example, the rocket launcher and shotgun are powerful, but do not fire as fast as the plasma or lightning gun.
Each arena is well-designed with hardly any areas that give a player an advantage over another. Closed arenas have multiple walkways and tunnels and open arenas have pitfalls and lifts to send players across the maps. Though the arenas are fairly generic, there are a good number of them.