Call of Duty: Black Ops Zombies is a spin-off game of the Call of Duty series' immensely popular Nazi Zombies mode and a sequel to Call of Duty: ZOMBIES. Developed by Ideaworks Game Studio and published by Activision for the iOS, it was launched in select countries on December 1, 2011. The game will allow for 4-player multiplayer, and, as a new addition to the iOS platform, voice chat. The first map to be released will be Kino der Toten, Dead Ops Arcade has also been fully transformed to the iOS platform, with 50 levels, and the player will be able to play as the four characters from the console version, which are Tank Dempsey, Nikolai Belinski, Takeo Masaki and Doctor Richtofen, as well as the four ramdom characters from Dead Ops Arcade and a "rookie" soldier in the tutorial. Activision has also stated that further map packs will be released in the near future, free of charge, and Ascension is listed as coming soon in the map selection.