Debuting all the way back in 2008 with the release of Call of Duty: World at War, Call of Duty Zombies has enjoyed a rather lengthy and prosperous career so far, going from a simple secret mode that was never really intended to be in the game, to one of the main selling points of the entire franchise. Over the last 16 years, Call of Duty Zombies has seen its fair share of controversial changes, with some of the most recent swapping the traditional round-based structure for a more open-world approach. But a good Call of Duty Zombies map can come from anywhere, regardless of a game's odd new mechanics or unnecessarily different structure.