you unlock cheats such as a bad year where enemies turn into tires when you shoot them on single player
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the only cheats that you can unlock in call of duty 4 are the ones from collecting Intel in the single player campaign. Other than that there are no other cheats for call of duty 4.
The intel items in Call of Duty: Modern Warfare 2 only unlocks trophies (PS3) or achievements (Xbox 360) when the player has collected 22 and 45 of the intel items. Unlike Call of Duty 4: Modern Warfare; collecting intel items do not unlock cheats for the single player campaign.
call of duty 2
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
Call of Duty 1. Call of Duty 2: Big Red One Call of Duty 3. Call of Duty 4: Modern Warfare Call of Duty 5: World at War Call of Duty 6: Modern warfare 2 Call of Duty 7: Black Ops Call of Duty 8: Modern warfare 3 Call of Duty 8: Black Ops 2