I'm pretty sure that you just have to beat the game to get it
You receive an achievement and you unlock the first Nazi zombies level, nacht der urden.
Complete Solo Campaign on any Difficultly
yes, you just have to beat the game.
you unlock "five" the pentagon level for zombies. you also unlock the dead ops zombie arcade game.
Yes. You unlock the mode once you have completed all the missions.
u get it by playing through about 4 days woth of level, it is awsome
You unlock it after reaching a certain level.
No, but when you beat the campaign on World at War, you do unlock zombies mode. You also unlock the map "Five" on Black Ops for completing the campaign, unless you use the terminal in the main menu room.
U can unlock guns by killing a certain amount of zombies or doing certain achievents
kill all the zombies
It has yet to come out, since the call of duty: black ops hardened prestige edition is not out.
you cant why would u think that u could