You need to have the game in your harddrive to play online
No site without buying the game Call of Duty Black Ops or Call of Duty World at War
you can't
4 players
By buying it
To buy something you must pay or it is not buying
No
The best one would have to be Call of Duty 3 on PlayStation 2. Yes you can go online on it.
All of the newer call of duty games can be played online. I've been playing since Call of Duty 4, and they are making Call of Duty 8 right now, and all have been online enabled.
no
I think you can't.
Yes, Call of Duty: Black Ops will have online multiplayer just like many other Call of Duty video games.
yes, call of duty world at war has online. you go into multiplayer and click play online.