Multiplayer is a game mode that appears in all S.T.A.L.K.E.R. games.
Game types
Team Play
Deathmatch, the first team with the highest score wins.
Artifact Hunt
Both teams must find artifacts, the team with the highest score wins.
Artifact Capture
One team must Capture the opponent Artifact (possibly a Moonlight Artifact) and take it to their own base.
Free for All
The player may kill anyone.
Factions
There are two factions in Multiplayer, Freedom and Mercenaries.