In order to enable cheats to be used with the single player version of Call of Duty, you must follow these steps:
1. Right click on the Call of Duty Single Player shortcut and select "Properties"
2. In the "Target" field enter(w/o quotes) "+set thereisacow 1337 +set developer 1 +set sv_cheats 1 +set monkeytoy 0" (i.e. "C:\Program Files\Call of Duty\CoDSP.exe" +set thereisacow 1337 +set developer 1 +set sv_cheats 1 +set monkeytoy 0)
3. Start up COD, press the tilde key (~) to enter console.
4. Enter the below cheats for desired effect.
Call of Duty Cheat Codes:
• god - Invulnerability
• give "object name" - "object name" is some object in game such as BAR
• give all - give all items
• give ammo - maximum ammunition
• give health - fully heals
• g_gameSkill - Sets game skill level
• jumptonode - Jumps to specific part of map
• kill - kill self
• notarget - Enemies will not shoot you
• noclip - walk through walls
• timescale X - Alters speed of game, X is a multiplier
• ufo - fly