You do not play Black Ops like that. The game requires a game disc or a full download
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If there isn't a download on the store with call of duty, then no. You can play call of duty 3 onwards on the PS3.
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.
yes, call of duty world at war has online. you go into multiplayer and click play online.
Only one person per X-box can play Call of Duty 4 online.