Dead Ops Arcade

• The Dead Ops Zombie arcade mode is a hidden zombie map Easter Egg, which, unlike the main game, has a top-down view. To play it, load up the game and, when on the main menu, rapidly tap the left and right trigger buttons. Your character can now move. Walk to the wall in front of you, then go to the computer in the left corner. Press the interact button, then type “DOA” into the terminal. You'll be taken to the mini-game.
  
  

The “Five” Map Shortcut

• “Five” is a zombie map set in the Pentagon, where players play as Cold War figures John F. Kennedy, Richard Nixon, Robert McNamara, and Fidel Castro. “Five” is a multi-layered level with plenty of interactivity, including the ability to set the Pentagon to Defcon 5. If you're impatient, there is a secret way to get this map without winning the campaign. Go to the terminal as with the Dead Ops Arcade secret, only this time type in “3ARC UNLOCK.”
  
  

Secret Songs

• In the “Kino Der Toten” map, approach the glowing rocks and hold the interact button. These are behind the coach in the room you start in, on a pedestal in the room with the mannequins, and next to the stairs on a shelf. Elena Siegman's “115” will play. In “Five,” interact with the telephones in the hallway, the room with the Pack-a-Punch and the room with the power switch. Eminem's “Won't Back Down” will play.
  
  

Portrait Reactions

• In “Kino Der Toten,” go to the room which has the portraits on the wall. These are actually paintings of the four player-characters on this map. Approach them and hold down the interact button. Your character will comment on the picture. Each character has something different to say about the others, and their comments reveal the relationships between them, and more about how they got into this situation.