Call of Duty: Black Ops 6 Zombies is full of Easter eggs, and some of them are stranger than the others, such as the Rat King Easter egg in Citadelle des Morts. This Easter egg can reward players with free perks, ammo mods, essence, salvage, and even a golden crown to wear for the rest of the match (if you know how to solve it).

Citadelle des Morts is the new Zombies map introduced after the release of Season One Reloaded in Call of Duty: Black Ops 6. Set in an ancient gothic castle, it's large, eerie, and full of challenges.