yes 6 player mach or 2 player zombie mode
No the game version must be the same to play
Unfortunately, you can't change any of the settings in Black Ops multiplayer.
Yes there is.In every single Call of Duty game (From WaW to the newest version) on the Nintendo DS/Nintendo DSi there is multiplayer.
Nuketown is a playable map to all players in the multiplayer. You can access it from the main menu.
In Call of Duty: Black Ops, to go on multiplayer you have to go to multiplayer on the menu that says: CAMPAIGN MULTIPLAYER ZOMBIES OPTIONS
Yes.
Simply go to the black ops multiplayer settings and disable the aim assist
in black ops multiplayer, everything's unlocked already.
Online Xbox 360 play is not free and the online multiplayer mode of Black Ops is the only format for multiplayer
Yes. Both modes are one game. Black Ops 2 includes a Singleplayer campaign, a Multiplayer, and Zombies!
No
Black-ops will have an offline version of the multiplayer, with AI opposition. Also you will be able to level up as if you were online =)