Grand Theft Auto 3

Change outfit:
While playing, press Right, Down, Left, Up, L1, L2, Up, Left, Down, Right.

Crazy people:
While playing, press R2, R1, Triangle, X, L2, L1, Up, Down.

All people hate you:
While playing, press Down, Up, Left, Up, X, R1, R2, L1, L2.

Higher Wanted Level:
While playing, press R2, R2, L1, R2, Left, Right, Left, Right, Left, Right.

Lower Wanted Level:
While playing, press R2, R2, L1, R2, Up, Down, Up, Down, Up, Down.

Tank:
While playing, press Circle, Circle, Circle, Circle, Circle, Circle, R1, L2, L1, Triangle, Circle, Triangle.

Speed up time:
While playing, press Circle, Circle, Circle, Square, Square, Square, Square, Square, L1, Triangle, Circle, Triangle.

People fight each other:
While playing, press Down, Up, Left, Up, X, R1, R2, L2, L1.

People fistfight each other:
While playing, press Right, R2, Circle, R1, L2, Down, L1, R1.

Great car handling:
While playing, press R1, L1, R2, L1, Left, R1, R1, Triangle.

Gore Mode:
While playing, press Square, L1, Circle, Down, L1, R1, Triangle, Right, L1, X.

Clear Weather:
While playing, press L1, L2, R1, R2, R2, R1, L2, Triangle.

Foggy Weather:
While playing, press L1, L2, R1, R2, R2, R1, L2, X.

Cloudy Weather:
While playing, press L1, L2, R1, R2, R2, R1, L2, Square.

Rainy Weather:
While playing, press L1, L2, R1, R2, R2, R1, L2, Circle.

Marathon runner:
The hero in GTA3 gets tired of sprinting after holding X down too long. To overcome this tap X quickly and he will runner faster and longer,

Free repairs:
To repair your car for free, go to your hideout and put your car in the garage. Leave the garage so the door closes. Enter the garage again and your car will be as good as new. Note! This does not get rid of the cops. It only fixes the damage.

Unlock Staunton Island:
You have to complete the last Mafia Mission (by sinking the Cartel ship)

Unlock Shoreside Vale:
You have to finish the mission from Donald Love in which you have to kill Kenji of the Yakuza

Finding the fastest car in Portland:
Stuck in Portland and can't find yourself a good car? Head to the car dealership next to 8-ball's place and drive through the windows to find yourself a Viper.

Make your car "fly":
With the code where the pedestrians fight, it along with the improved handling cheat can make the car "fly". When you are at an incomplete bridge, like if you haven't gotten to Shoreside vail from Stautan Island, you get past the barricades, and be careful not to floor it for too long or you will lose control (be familiar with the brakes.) But when you get to the straightaway, floor it and dont move the joystick. When you are in the air with the descent pull the joystick back and you go even further and you land on the bridge - simply the cheats to get all places - except you can't save.

Drive-by:
To do a great drive by killing equipt the uzi's and go into first person mode while in the car. Then press and hold L2 or R2 to look out of the left or right side window. Then while holding one down press Circle to fire the uzi and mow down people on the side-walk

Bulletproof Patriot:
Complete the mission from Ray (the cop) on Stanton Island called "Marked Man" and you will receive the keys to his stash. This contains a flamer, rocket launcher and a lot of cash as well as a bullet-proof Patriot.

Monotov Cocktail (portland):
Go through the tunnel near 8 balls place and kill the 4 tramps inside. Each of the tamps is carrying a Molotov cocktail. (They won't throw them at you bu they will run)

Buggy:
Go to portland, and do all the mafia missions, get to the second level "Staunton Island." You might remember when you took Joeys missions that you saw a cool buggy kind of car. Well you can drive it. Go near your hideout, to the car park near pay and spray. The gang car park between 19.00 and 00.00 its parked on the right. It does get damaged, but its engine is cool!

Car trick:
This is really a cheat, but more of an interesting thing I found. First park a car in the garage at your hideout. Go out of it but stay close enough to it that the door stays open. Before doing this, make sure you have full armour and health, plus a rocket launcher. Aim the launcher at the car and fire. You'll be propelled outside, but if you go inside the garage, the car will be good as new, and on occasion, a different car.

Mission Cheat:
Before you accept the "Fuzz Ball" cheat, go to the shipping shipping docks. Near there you will find two tour busses. They will enable you to pick up alot of girls at once.

Rampage Sniper Trick:
For rampages in which you are required to shoot down other gang members with a sniper, if you release R1 after killing one and press it again after like a split second, more targets will appear on the screen.

Get rid of all cars:
To get rid of all cars, including cops, FBI, and all normal cars driving around, excluding mission cars, and parked cars, just create about 10 tanks with the tank cheat, for some reason the game will not load traffic and your free to do as you please on empty roads! Use the destroy all cars cheat to undo this cheat.