Call of Duty: World at War - Zombies is a spin-off game based on the widely popular Nazi Zombies mode of Call of Duty: World at War. The game allows for multiplayer cooperative gameplay locally via a Wi-Fi or Bluetooth network, or globally through the internet. Originally, the game supported downloadable content, in the form of Verrückt and Shi No Numa. However, a future update made the two maps free. The game later had a sequel, Call of Duty: Black Ops Zombies.