
Zombies, originally known as Nazi Zombies, is a survival-type game mode. First appearing in Call of Duty: World at War, it became highly popular upon the game's release, and returned in Call of Duty: Black Ops. In most maps the player faces zombies of other nationalities, including American zombies on "Five", Imperial Japanese zombies on Shi No Numa, Soviet zombies on Dead Ops Arcade (however Nazi Zombies also appear), Ascension and Call of the Dead, and Asian zombies on Shangri-La. It is unknown at this point in time what kind of Zombies are located on Moon. Zombies content is only considered canon in its own universe.
Up to four players must survive endless waves of attacking Zombies, earning points from killing zombies and repairing defenses. These points may be used to purchase weapons and perks
in the process, or to unlock new areas and activate other special
objects. Zombies enter the player-accessible area of the map via
windows, holes in walls, or climbing out of a "dirt" surface, which are
initially barricaded but will be rapidly demolished by zombies. They can
be repaired, however, with the exception of the dirt surfaces. There is
no limit to the number of rounds; the game will end when all players
have been incapacitated or killed by the zombies. Zombies become
stronger and faster upon the completion of each round, forcing players
to make tactical decisions about point spending and progressing through
the map. On occasion, zombies will drop power-ups such as Max Ammo, Nuke, or Insta-Kill upon their death, making the round easier.
Altogether, Zombies consists of eleven maps; the first, second, fourth, fifth, and seventh feature Nazi zombies (Nacht der Untoten, Verrückt, Der Riese, Kino der Toten, Dead Ops Arcade), while the third features Imperial Japanese zombies (Shi No Numa), the sixth features American civilian, military and scientist zombies ("Five"), the eighth features Russian scientist, cosmonaut and military zombies (Ascension), the ninth features Russian sailors and divers (Call of the Dead), the tenth features Himalayan civilian zombies (Shangri-La), and the eleventh features astronaut and American military zombies (Moon).
Shi No Numa, Der Riese, Kino der Toten, Ascension, Shangri-La and Moon all have the same four playable characters (often dubbed as the "Original Group") Tank Dempsey, Nikolai Belinski, Takeo Masaki and Edward Richtofen. They are also heard in Call of the Dead. They also appear in the Call of Duty: Black Ops versions of Nacht der Untoten and Verrückt, while "Five" has characters who actually existed in real-life (John F. Kennedy, Fidel Castro, Robert McNamara, and Richard Nixon). Call of the Dead features real-life celebrities as the characters and one as an enemy (Robert Englund, Sarah Michelle Gellar, Danny Trejo, Michael Rooker, and George A. Romero). The Call of Duty: World at War versions of Nacht der Untoten and Verrückt, and Dead Ops Arcade have unidentified playable characters.
The Zombies game mode is also known for carrying on the tradition of odd easter eggs within Call of Duty games like teddy bears. These easter eggs used to be found primarily in the campaign but are now usually found within the Zombie maps, and as of Call of the Dead, now include achievements/trophies upon completing these easter eggs.
Screenshot


Gameplay Video
youtube.com/watch?v=FsKdbWNi3cI
youtube.com/watch?v=iVBpldafqNA
Personal opinion: 8/10
Maybe this mode isn't that scary, but I think it's a very good and intense co op game.