Call of Duty: Black Ops 1 marked a pivotal shift for Treyarch’s Zombies mode, moving from a simple survival arcade game to a narrative-driven, puzzle-heavy experience. The four DLC maps significantly expanded the original cast, introduced complex Easter Eggs that impacted global leaderboards, and concluded with a controversial, timeline-altering finale on the Moon. These maps are widely regarded as the “Golden Age” of Zombies due to their creativity and difficulty.