Multiplayer gameplay is class based. Each class can choose an appropriate primary weapon and a side arm, as well as carry explosives such as frag grenades or Molotov cocktails. Players are able to unlock more powerful weapons within each class by spending up to three "blood diamonds" on a class; diamonds are earned through experience points gained by killing other players and completing objectives. Potential upgrades for individual weapons within a class include operation manuals, maintenance manuals, and bandoliers.

There are six classes:

* Commando - "Mid-range assault class. Effective at fire-and-movement tactics."
* Sharpshooter - "Long-range specialist. Armed with highly accurate weapons."
* Guerrilla - "Short-range class. Specializes in close combat and ambush tactics."
* Rebel - "Specialist in explosives and fire. Strong on offense or defense."
* Gunner - "Heavy firepower specialist. Highly effective from static firing positions."
* Saboteur - "Equipped with silenced weapons. Specializes in stealth tactics."