you need to buy call of duty mw3 and you need to register for call of duty elite
You should buy either Call of Duty Black Ops, or Modern Warfare 1.
You can't play Call of Duty on a website. You have to buy it.
you can buy it at gamestop
well 4 has better graphics and you should buy that
You buy the PC game for Call of Duty World at War
eBay
That depends on which Call of Duty you are referring to. A zombie mode is present in Call of Duty Black Ops and COD World at War. You don't have to buy anything other than the game, these modes are included.
when you buy an add on for call of duty (or any other game for ps3) it goes strait to the downloading screen
Buy them a DLC.
Buy him Call of Duty
Downloading a Call of Duty game is not legal if you do not buy the game