We have 10 cheats and tips on N64. If you have any cheats or tips for South Park please send them in here. We also have cheats for this game on : PlayStation : PC
For more Codes for South Park go to:
South Park GameShark Codes
You can also ask your question on our South Park Questions & Answers page.
Go to the cheat menu and type in "cheatingisbad" to unlock a character.
Just go down to cheats on the main screen and put in bobbybird
Hope I helped ^_^
At the main menu go to the cheats section and type this down:
Cheat code Effect
ASSMAN - Invincible
BOBBYBIRD - Master Cheat
Say Valad if correct. Or say Bogus if wrong. I don't know if these codes are correct but someone told me. I don't have a working N64. It crashed down on me. So I can't play south park... Unless I go to www.Romhustler.net
Enter all the below on the cheesey poof decoder thing (the cheat thing on the main menu)
Get all characters in multi-player mode: OMGTKKYB 
Invincibility: ASSMAN

Level Select THEEARTHMOVED 
All Weapons FATKNACKER 
Infinite Ammo FATTERKNACKER 
All characters in Multiplayer Mode OMGTKKYB
Unlock Terrance RAFT 
Unlock Phillip PHAERT
Unlock Starvin Marvin SLAPUPMEAL 
Unlock Mr. Mackey CHEATINGISBAD 
Unlock Chef LOVEMACHINE
Unlock Wendy CHECKATACO
Unlock Pip FISHNCHIPS 
Unlock Ike KICKME 
Unlock Mrs. Cartman ALLWOMAN
Unlock Jimbo STARINGFROG
Unlock Big Gay OUTRAGE 
Unlock Barbrady ELVISLIVES
Unlock Alien MAJESTIC
Unlock SkinnyVEGGIEHEAVEN
View Credits SCREWYOUGUYS
Pen & Ink Mode: PLANEARIUM
Big Head Mode:MEGANOGGIN
Unlock Mephisto: GOODSCIENCE
Unlock Mr. Garrison: DOROTHYSFRIEND 
Unlock Ned: HAWKING
Or if you want all of the above enter
: BOBBYBIRD
The master cheat is bobbybird.
To unlock everything enter "BOBBYBIRD" at the cheats
Type in bobbybird in the cheats menu and you will get evrything while playin!
At the very end where you have to destroy the big robot, hit him with Terrence or Phillip dolls (be sure to get out of the way, type in BOBBYBIRD for all of the cheats plus invincibility)
When ever the robot goes to recharge, take out your pirahna throwing gun(sweet!) and keep shooting at the green button until he gets out of the recharger, continue to throw Terrence and Phillip dolls at him.
Type in elvis and you start at the 2nd level
For all the cheats enter at the cheat cheesy poof decoder BOBBYBIRD it really works! it also gives u the alien in multiplayer!