MP: A cooperative/competitive game type where you attempt to top the objective. You help against your defenses you may use weapons, perks, specials (occasionally pop-up when killing a zombie) and boarding up windows. Zombies: A cooperative game type to either play alone or up to 4 players, including yourself, to fight and protect yourselves for a number of waves, each wave being harder than the one before. Call Of Duty United Offensive Steam Cd KeyĬall of Duty: Black Op Multiplayer is a game type where many players either online, through LAN, or on the same console gather in a pregame lobby to play cooperatively or comp etitively to complete a certain mission.
