No, but if you want your friend wants to play on a separate game system then yes. Also there is a splitscreen
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you should be able to play it offline like ps3 and other consoles that doesnt require internet connection
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.
its already out and yes it has zombies so get out there and have some fun
If you have a PS3, X-Box 360, or Wii, you have to have an internet connection. PS3 requires you to make an internet connection and create a PSN account, then you can play online. X-Box 360 requires an internet connection, then you have to sign up for X-Box Live for online play. And as for Wii, you have to make an internet connection, and that's it.