There are no cheat codes that I know of for Modern Warfare 2. http://www.ModernWarfareCentral.com/
there are no cheat codes
There aren't any cheats in Modern Warfare 2, there is only modz
no there not ive tried
NO
Nope.
if you were the one who asked this you are a retard there is not one
yes
No,there is nothing like zombie cheat not in PSP and not in PC.But you can add a zombie mod in GTA VC PC.
there is a cheat for just about every game there is, all you need is a J-Tag (about $50-200 on eBay), if you aquire such an object, you can put a cheat code into any game there is.
There is not a beta code
The Call of Duty wikia is a site