South Park

All cheats enabled:
Enter BOBBYBIRD as a code. Note: Enter ZBOBBYBIRD in the EU/PAL version of the game.
Information in this section was contributed by xobigboyox, Kentcatw, Son Goku, Graham Vickers, KCT, and others.

Level select:
Enter THEEARTHMOVED as a code.
Information in this section was contributed by xobigboyox.

Invincibility:
Enter ASSMAN as a code.
Information in this section was contributed by xobigboyox.

All weapons:
Enter FATKNACKER as a code.
Information in this section was contributed by xobigboyox.

Unlimited ammunition:
Enter FATTERKNACKER as a code.
Information in this section was contributed by xobigboyox.

All characters in multi-player mode:
Enter OMGTKKYB as a code.

Officer Barbrady:
Enter ELVISLIVES as a code.

Mr. Mackey:
Enter CHEATINGISBAD as a code.

Phillip:
Enter PHAERT as a code.
Information in this section was contributed by xobigboyox.

Terrance:
Enter RAFT as a code.
Information in this section was contributed by xobigboyox.

Mr. Garrison:
Enter DOROTHYSFRIEND as a code.
Information in this section was contributed by xobigboyox.

Chef:
Enter LOVEMACHINE as a code.
Information in this section was contributed by xobigboyox.

Wendy:
Enter CHECKATACO as a code.
Information in this section was contributed by xobigboyox.

Pip:
Enter FISHNCHIPS as a code.
Information in this section was contributed by xobigboyox.

Ike:
Enter KICKME as a code.
Information in this section was contributed by xobigboyox.

Mrs. Cartman:
Enter ALLWOMAN as a code.
Information in this section was contributed by xobigboyox.

Mephisto:
Enter GOODSCIENCE as a code.
Information in this section was contributed by xobigboyox.

Jimbo:
Enter STARINGFROG as a code.
Information in this section was contributed by xobigboyox.

Ned:
Enter HAWKING as a code.
Information in this section was contributed by xobigboyox.

Big Gay Al:
Enter OUTRAGE as a code.
Information in this section was contributed by xobigboyox.

Alien:
Enter MAJESTIC as a code.
Information in this section was contributed by xobigboyox.

Starvin Marvin unlocked:
Enter SLAPUPMEAL as a code.
Information in this section was contributed by xobigboyox.

Skinny mode:
Enter VEGGIEHEAVEN as a code.
Information in this section was contributed by xobigboyox.

Big head mode:
Enter MEGANOGGIN as a code.
Information in this section was contributed by xobigboyox.

Pen and ink mode:
Enter PLANEARIUM as a code.
Information in this section was contributed by xobigboyox.

View credits:
Enter SCREWYOUGUYS as a code.
Information in this section was contributed by xobigboyox.

Hint: Defeating Ultra Mega Mega Man:
Whenever Ultra Mega Mega Man run backs to get more health, go over to the platform where he charges up. Hit the button on the right when it starts blinking to prevent him from recharging.
Information in this section was contributed by PBStudMufN.

When fighting Ultra Mega Mega Man, shoot him three times with the Super Sniper Chicken (which is provided for you in his "lair"). When he starts to spaz out and lower his head, wait until you see him walking towards the power station in the corner of the room. Get right behind him, and after about three to four eggs to his power pack, Ultra Mega Mega Man will be no more. This way, you do not have to keep shooting the large octagon-shaped button to stop his recharge process. Even if you do this, you will still have to shoot him in the back anyway, and he will still try to recharge.
Information in this section was contributed by Adam Jackson.

Hit Ultra Mega Mega Man with Terrence and Philip dolls until he goes back to his stand. Shoot the target next to the robot before he is done recovering and repeat until he is defeated.
Information in this section was contributed by Goemon92.

More speed:
Hold C-Up and press C-Left or C-Right to run at an angle at higher speed.
Information in this section was contributed by Jesse Panesar.

Hint: Easy win in Head To Head mode:
Note: This trick is easier with the "Infinite ammo" code enabled. Go to Head To Head mode with any character and level Cycle through your weapons until you find the Alien Dancing Gizmo (which makes your enemies dance when hit). While he or she is dancing, you can quickly get the Cow Launcher and shoot a cow at them.

Hint: Multi-player Badlands 2: Secret passage:
In multi-player mode, choose the Badlands 2 level. There is an area that has an "island" in the middle of the level. On top of the "island" are invincibility cans and sniper chickens, with no apparent way to reach them. Go down next to the "island" on the ground. Hug up against the wall of the "island". Walk around it, keeping pressure on the wall. On one of the four sides is a secret passage that cannot see. If you stay against the wall, you will go in to a little cave with a warp in front of you. Step on the warp and it will send you on top of the "island" with the power-ups.
Information in this section was contributed by Drummin2daend.

Note: For a faster search, notice that there are flowers in the level. They indicated that the secret passage is beside them.
Information in this section was contributed by jonathan mateos whatton.

Hint: Powerful weapons:
To make your weapons more powerful, press Down and some of them will change. For example, when you have the snowball and do this, your the character will urinate on the snowball, then throw it.
Information in this section was contributed by LuVDoC4GuRlZRMX.

Dodge Ball: The ball will have a lightning bolt symbol on it and it will be thrown faster.

Terrance and Phillip Dolls: Switches from Philip to Terrance. Terrance dolls are used as "Farting Proximity Mines" and will inflict much more damage.

Toilet Plunger: Instead of firing one plunger at a time, it will fire three at once.

Warpo Ray: Changes from a blue piranha to a beam that can make the characters smaller or changes into a purple beam that changes characters into animals. Note: This only works in multi-player mode. It inflicts more damage in story mode.

Alien Dancing Gismo: Turns into a sensor that activates when characters walk pass it. The effect of the Alien Dancing Gismo only works in multi-player mode. It makes characters sing and dance.

Dart Gun: Change bullet ammo into huge darts.

Note: There is no effect with the Cow Launcher and the Super Sniper Chicken.

Glitch: Remain shrunk:
In multi-player mode if you get shrunk, get an invincibility can just before you get big again. You will stay shrunk for the remainder of the game, even if you die.
Information in this section was contributed by Rhett Linden.