Activate the following cheats by pressing the corresponding sequences of buttons during gameplay: Note: Do not save the game while codes have been enabled. It may affect your game statistics, and may cause glitches. Also, some codes cannot be disabled:
L, R, TRIANGLE, L, R, CIRCLE, L, R.
SQUARE(2), R, X(2), L, CIRCLE(2).
All pedestrians, cars, Portland, Staunton Island, and Shoreside Vale unlocked in Multiplayer mode
UP(3), TRIANGLE(2), CIRCLE, L, R.
Better handling vehicles
L, UP, LEFT, R, TRIANGLE, CIRCLE, DOWN, X. Press DOWN after this code is enabled to make your car jump.
Big head mode
DOWN(3), CIRCLE(2), X, L, R.
CIRCLE(2), R, TRIANGLE, L, SQUARE(2).
Change motorcycle tire size
CIRCLE, RIGHT, X, UP, RIGHT, X, L, SQUARE. Repeat the code to cycle the tire sizes between large, small, and normal.
TRIANGLE, R, L, DOWN(2), R(2), TRIANGLE.
UP, DOWN, CIRCLE, UP, DOWN, SQUARE, L, R.
L, DOWN, LEFT, R, X, CIRCLE, UP, TRIANGLE.
Destroy all cars
L(2), LEFT, L(2), RIGHT, X, SQUARE.
Drive on water
CIRCLE, X, DOWN, CIRCLE, X, UP, L(2).
L, R, CIRCLE, L, R, X, L, R.
Faster game time
L(2), LEFT, L(2), RIGHT, CIRCLE, X.
R(2), L, R(2), L, DOWN, X.
UP, DOWN, TRIANGLE, UP, DOWN, X, L, R.
Forty three pedestrians, two locations, seven gangs unlocked in Multiplayer mode
UP(3), X(2), SQUARE, R, L.
Fourteen pedestrians, Portland, two gangs unlocked in Multiplayer mode
UP(3), SQUARE(2), TRIANGLE, R, L.
L, R, X, L, R, SQUARE, L, R. Note - If this code is enabled when your car is smoking or damaged it will get repaired.
UP, DOWN, X, UP, DOWN, TRIANGLE, L, R.
Pedestrians attack you
L(2), R, L(2), R, UP, TRIANGLE.
Pedestrians follow you
DOWN(3), TRIANGLE(2), CIRCLE, L, R.
Pedestrians have weapons
R(2), L, R(2), L, RIGHT, CIRCLE.
L(2), R, L(2), R, LEFT, SQUARE.
UP, DOWN, SQUARE, UP, DOWN, CIRCLE, L, R.
Random pedestrian costumes
L(2), LEFT, L(2), RIGHT, SQUARE, TRIANGLE. Note: After this code is enabled four times, it locks your movement unless done under one of the following conditions. If your movement becomes locked, either reload your saved game file or enable the "Commit suicide" code to return to normal at the hospital with your new costume. When inside a car or on a bike, enter the car or get on the bike, enable the code, then press TRIANGLE to exit the car or bike. Your controls will not be locked. You can also reenter the same car and repeat it as many times as desired.
Return to normal from upside down
TRIANGLE(3), UP(2), RIGHT, L, R.
Return to normal from upside up
UP(3), TRIANGLE(2), SQUARE, R, L.
Ride with passenger
While in a vehicle with nearby pedestrians, press X, SQUARE, DOWN, X, SQUARE, UP, R(2). The nearest person will enter your car or get on your bike.