Zombie mode is survivial in waves, each wave lasts untill you kill an amount of zombies, you dont play as your own character but play as the characters from WAW or in a certain map JFK, ammo comes from max ammo powerups or from buying them from walls, purchasing doors allows you to move around the map getting better weps, power, ect.
Weapons in multiplayer are unlocked as you level up, the customization is great, plenty of guns, good amount of maps.
