Zombie Barrer Glitch No Mod:

When you start the zombie match co-op or single player run to the door in the main room. Face the door and turn around. Under the stairs is a broken pillar. Walk to the pillar and face the crack and back up all the way. Run towards the pillar and press (A) and (B) at the same time. You should end up in the pillar if done correctly. when you turn around try to press (B) if it does not let you. If you have done it right you won't move at all. You can look around if the round begins and you see a zombie coming towards you it should be unable to touch you. NOTE: if you updated the game this glitch will not work.