Several Call of Duty games have included the Zombies mode. The first game to feature Zombies was Call of Duty: World at War, released in 2008. Since then, most Call of Duty games have included a Zombies mode, including Call of Duty: Black Ops, Call of Duty: Black Ops II, Call of Duty: Black Ops III, and Call of Duty: Vanguard. The Zombies mode has evolved over the years, with each title offering unique gameplay experiences, characters, and maps. It is a first-person shooter survival mode where players must defend against waves of zombies. The best Call of Duty Zombies game is subjective and varies from player to player.