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Yes, you can play it offline
Yes, you can. You can play the campaign offline and against friends in split-screen mode.
Yes.
yes
no
you cannot get a rank offline. only on the online feature. if you play offline it is either in story mode or with a friend.
The PSP does not have a Call of Duty game so it can not play any Call of Duty offline or onliine
Sadly, you can not. BUT you can play offline bots with 2 people.
Enter no password, and the options will appear of 'play offline' or 'try again'. Select play offline.
You can't. There is no offline play mode.
Things
It's currently impossible to play RuneScape offline.