Players are awarded points for replacing barricades as well as killing zombies. As the rounds progress, difficulty increases and the zombies can remove barricades faster. Zombies enter from outside the playable map via barricaded entries. Some maps have different variations of zombies that spawn on specific waves, like zombie hell hounds. These points are used to buy weapons, perks, and access to different parts of the map. As players fight the zombies, they receive points.

The player begins the game with a Colt 1911 and has access to a melee attack via a combat knife, as well as a maximum of 4 hand grenades. The objective of the game is to survive each round of invading zombies after which a more difficult round begins. SS soldiers who have become zombies attempt to infiltrate the bunker and attack the players, and the players must defend themselves in the process.

The game's setting originally takes place in a German bunker (Nacht der Untoten) during World War II from the viewpoint of a US Marine. A sequel to the game, Call of Duty: Black Ops – Zombies, has been published by Activision.

It also comes with the three other maps, Verrückt, Shi No Numa, and Der Riese. The game allows for multiplayer cooperative gameplay locally via an ad hoc Wi-Fi or Bluetooth network, or globally via the internet. The game was released worldwide for iPhone on November 16, 2009, and for iPad on April 1, 2010. It is a spin-off of the Call of Duty series, and based on the Zombies mode of Call of Duty: World at War. Call of Duty: World at War – Zombies (also known as simply Call of Duty: Zombies) is a first-person shooter video game developed by Ideaworks Game Studio, and published by Activision for iOS.

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