How do you unlock all zombie maps on black ops?

kino comes by default which means its already unlocked when you get the game. then five is unlocked by completing the campaign on any difficulty. then dead ops arcade is unlocked by escaping from the torture chair in the main menu and to do so tap RT and LT Repeatedly and entering a code on the computer behind the chair the code is DOA .the next map is ascension you download a dlc called first strike. then you get call of the dead by downloading a dlc called escalation then theres a map called shangri la which you get by downloading the dlc called anihalation.last you get the map moon and the 4 remake maps from world at war by downloading the dlc called rezzurection.I Hope This Helps