Corky Lehmkuhl, studio creative director at Treyarch, explained to IGN India that a lot of development work goes into the various Zombies Easter Eggs, only for a very small percentage of players to actually see them in-game.
There’s a good reason why Zombies mode in Call of Duty: Black Ops Cold War managed to attract so many new players.
We recently, of course, saw the release of the first big-scale Zombies experience in Outbreak, something Lehmkuhl said Treyarch has been trying to make since the original Black Ops.
Black Ops Cold War Zombies fairly clearly communicates to players the steps they need to perform in order to get unique weapons and see the main story through.