There are an infinite number of levels. The game does not ever stop providing the next level when you have managed to kill all the Zombies at the current level. Some of the level counters are only two positions, but that does not mean the levels stop at 99. It is called a survival mode and is not designed for someone to be able to beat the game. I am surprised you don't already understand that you are not able to win in zombie mode.
15 levels if you finish them you get a zombie map
you just have to beat the levels for the next zombie game
There is not a highest round. The Zombie mode is a survival type format that you can not win and can only continue the new levels until you are killed.There are an infinite number of new levels for every one of the Call of Duty zombie mode series maps for All three Treyarch developed Call of Duty Games (Call of Duty Black Ops, Call of Duty Black Ops II, and Call of Duty World At War) with the Zombie Maps 5 bcause i got close to my personal best but died on dogs also add on psn - ImJustHuman
No
If you get call of duty black ops there is a zombie mode and you can play it online.(There are other call of duty's with zombie modes.)
unlimited
It does have a zombie mode and it is really fun.
The first World-at-War Zombie maps were released from February 2009 to August 2009. The popular cooperation levels (only canon within the Zombie genre) returned with Call of Duty: Black Ops (2010), Call of Duty: Black Ops II (2012) and Call of Duty: BLack Ops III (2015).
Zombie mode for call of duty is only available in World at War and Black ops and it is found in the start menu.
Call of duty black ops
Yes
in call of duty black opps