How do I play in call of duty 5 zombie maps on black ops?

I watched a video about one guy entering to Natch Der Untoten in Call of Duty Black OpsHow do I play in call of duty 5 zombie maps on black ops?
So far the only way to get the 4 World at War maps in Black Ops is to use a code that comes with the Hardened and Prestige editions. Also, while there has been no word that the maps will become available to buy for everyone, Activision has never passed up a chance to make more money, and this would certainly do the job.How do I play in call of duty 5 zombie maps on black ops?
You need to get the hardened or prestige edition of the game

which comes with a code that gives you the map packHow do I play in call of duty 5 zombie maps on black ops?
You could do Wut they say or game share it with someone who has it