Zombies, originally known as Nazi Zombies, is a tertiary gamemode developed by Treyarch, Ideaworks, and N-Space and was first introduced in Call of Duty: World at War (with the exception of the Wii, which was cut due to data limitations), later returning due to its popularity in Call of Duty: Black Ops (being introduced to the Wii), Call of Duty: Black Ops II (being introduced to the Wii U), and Call of Duty: Black Ops III. More installments of Zombies mode were made into Call of Duty: ZOMBIES, Call of Duty: Black Ops Zombies, and Call of Duty: Black Ops DS. Other variant gamemodes were made by Treyarch, Sledgehammer and Infinity Ward which base off of Zombies, called Cyborg Rising (Call of Duty: Online), Exo Zombies (Call of Duty: Advanced Warfare), and Infinite Warfare Zombies.