All Weapons:
While playing, press R2, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up

Full Health:
While playing, press R2, R2, L1, R1, Left, Down, Right, Up, Left, Down, Right, Up

Full Armor:
While playing, press R2, R2, L1, L2, Left, Down, Right, Up, Left, Down, Right, Up

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.

More money:
While playing, press R2, R2, L1, L1, Left, Down, Right, Up, Left, Down, Rithg, Up

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

Warp to Shoreside Vale:
While playing, press L1, L1, R2, Circle, Triangle, L2, R1, and X.

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

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

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

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

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

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

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

Blow up all cars:
While playing, press L2, R2, L1, R1, L2, R2, Triangle, Square, Circle, Triangle, L2, L1

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.

Bounce Baby Bounce:
Get in a Yardie Lobo, its a purple car with an off-white top and leopard print interior, and make it jump. It has a hydrolic system! To use it press L3, this makes all suspension go up or down. Use the right joystick to control individual tires, up and left for the front left tire, up for both front tires, up and right for the upper right tire, and so on. If the suspension is up when using the right joystick it will make the tire go down, if down it will make the tire go up.

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.

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 than Forrest Gump himself.

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 wich you have to kill Kenji of the Yakuza

Prostitute Trick:
This trick works best in the Red Light District. Get any car, except for a police car, FBI car, Ambulance, Fire Truck or Taxi, and pull alongside the sidewalk next to a girl wearing a Brown or Pink outfit. She will walk over to the car and begin bending over, like she's talking to you. A few seconds later she will get in the car. Drive to a secluded area (or your hideout) and stop the car. Be quick about it, because your money will drain for the amount of time she's in the car. Once the car is stopped, it will begin rocking. It'll rock slow, then it'll get faster. Your health is replenishing, but your money is depleting. Using the prostitute, you can get your health up to a maximum of 125. When you reach the maximum health, she'll get out of the car. Now, if your feeling particularly cold-blooded, you can get out of the car, chase after the prostitute, beat her, and take your money back.

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!

Flying Car:
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.

Flying Tank:
Activate both the improved car handling cheat and the people fistfight each other cheat. Then spawn a tank with the tank cheat. Hop into the tank and then twist your turret so that it is pointing towards the rear of the tank (180 degrees). When you fire the turret, it will propel you forward. Now find a straight piece of road and start firing. After about 10 sec or so of constant firing, your tank will begin to lift off the ground. As long as you keep tapping the fire button, you will be able to fly your tank through the air. It's not easy to control, but with a little work you can master manuvering. Now the entire world is yours to explore. Caution: If you go really high, and really far out, it will cause your game to freeze.

Drive-by:
To do a great drive by killing equip 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 recive the keys to his stash. This contains a flamer, rocket launcher and a lot of cash as well as a bulletproof Patriot.

Molotov 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)

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.

Car trick:
This isn't 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 armor 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.

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!

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.