Although a great game with great graphics for it's era the controls are a bit brutal with some kind of a running glitch and multiplayer isn't usable anymore unless you are using a very old phone. If you can push past that it's a good fun game that you would enjoy. If you are beginner in Call of Duty Black Ops Zombies mode then visit this COD dedicated site "downsights"
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No. Zombies is its special ops.
I believe Treyarch have released a statement saying that there will be Zombies in Call of Duty: Black Ops. Whether they are vietnamese, I don't know..
No.
you need to buy it
practice