The series spans several distinct eras, each introducing new mechanics and narrative arcs:
: Transitioned into the Dark Aether Saga , introducing global progression, loadout customization, and the "Exfil" mechanic, allowing players to end a match early for bonus rewards. The Storyline and Lore Call of Duty: Black Ops Zombies
: These titles expanded the scope with "buildables" (crafted equipment) and the GobbleGum system, which grants temporary specialized abilities. The series spans several distinct eras, each introducing