From StrategyWiki, the free strategy guide and walkthrough wiki

The game supports 8 player online and features four multiplayer modes:

Contents 1 Deathmatch 2 Team Deathmatch 3 Bum Rush 4 Crime Scenes

[edit] Deathmatch

The player to reach the kill limit or the player with the most kills at the end of the time limit wins.

[edit] Team Deathmatch

Two teams of multiple players compete for the most kills.

[edit] Bum Rush

Time based game of SCU Agents versus Influenced bums. The SCU cannot respawn, and must last as long as possible against the bums.

[edit] Crime Scenes

Pits the SCU agents against the Influenced. The Influenced must hide two cases of evidence, while the SCU agents must use their equipment to find the evidence before time runs out.

Several moves and weapons from single player are not present in multiplayer - these include the stun gun, kicks, chain attacks, and environmental kills.