run around in circles at the bouncing betty room and you must get the maginum or ray gun or wunderwaffle or doublebarrle shotgun for dogs and juggernaught
hey im pretty sure everyone is in call of duty black ops right now. just saying
You can also have the WaW maps on Black Ops, but I don't know how.
On solo, I would run in circles in the betty's room or around the path next to the STG's room. With 4 people, camp in the bridge and place some betties over there and you'll be fine for 20 at least.
You can also have the WaW maps on Black Ops, but I don't know how
I think they just track your progress from if you had WaW. I'm not sure why they would do that, but I haven't seen anything about buying the WaW zombie maps for Black Ops.