Select "Enter Cheat" from the main menu. Then, enter one of the following codes to activate the corresponding cheat function. If you entered the code correctly, the cheat will be displayed on the screen. Press Left, Right, C-Left, or C-Right to change the letter on the "Cheesy Poofs Secret Decoder". Press Start or A to enter a letter. Press B to enter the cheat. Select the "Cheats" option and set each enabled code as desired. All cheats entered can be saved after reaching a save point.
| Code | Result |
| BOBBYBIRD | All cheats enabled |
| THEEARTHMOVED | Level select |
| ASSMAN | Invincibility |
| FATKNACKER | All weapons |
| FATTERKNACKER | Infinite ammo |
| OMGTKKYB | All characters in multi-player mode |
| SLAPUPMEAL | Starvin Marvin unlocked |
| PHAERT | Phillip unlocked |
| RAFT | Terrance unlocked |
| DOROTHYSFRIEND | Mr. Garrison unlocked |
| CHEATINGISBAD | Mr. Mackey unlocked |
| LOVEMACHINE | Chef unlocked |
| CHECKATACO | Wendy unlocked |
| FISHNCHIPS | Pip unlocked |
| KICKME | Ike unlocked |
| ALLWOMAN | Ms. Cartman unlocked |
| GOODSCIENCE | Mephisto unlocked |
| STARINGFROG | Jimbo unlocked |
| HAWKING | Ned unlocked |
| OUTRAGE | Big Gay Al unlocked |
| ELVISLIVES | Officer Barbrady unlocked |
| MAJESTIC | Alien unlocked |
| VEGGIEHEAVEN | Skinny unlocked |
| MEGANOGGIN | Big head mode |
| PLANEARIUM | Pen and ink mode |
| SCREWYOUGUYS | View credits |
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Game Shark Codes
Unlock Cheat Modifier
810CD226 ????
Activate Cheat Modifier
810CD222 ????
Quantity Digits to Accompany Cheat Modifier Codes
0001 - Invincibility
0002 - All Players
0004 - All Weapons
0008 - Unlimited Ammo
0010 - Big Heads
0020 - Skinny Mode
0040 - Pen & Ink Mode
0080 - Level Select
0100 - Show Credits
01FF - All Cheats Enabled
