bigger or smaller moon [Submitted by:bradley]
Use the sniper gun and shoot the moon to make the moon bigger or smaller

Slower Gameplay [Submitted by:Giles]
Triangle, Up, Right, Down, Square, R1, R2

Faster Gameplay
Triangle, Up, Right, Down, Square, L1, L2

Invisable Cars [Submitted by:Tom]
During gameplay press L1, L1, Square, R2, Triangle, L1, Triangle. Note: Only your cars wheels will show

All Weapons
During gameplay press R2, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up

Flying (Dodo) car
While playing a game, press Right, R2, Circle, R1, L2, Down, L1, R1. When you do the code, Accelerate and press Up to fly.

Floor it [Submitted by:abdar ]
car floors when your on top of it- go on top of a car and shoot the front of the car and then the car will floor it.WARNING - sometimes it does not work just keep trying.

Full Health
During gameplay press R2, R2, L1, R1, Left, Down, Right, Up, Left, Down, Right, Up

Full Armor
During gameplay press R2, R2, L1, L2, Left, Down, Right, Up, Left, Down, Right, Up

Higher Wanted Level
During gameplay press R2, R2, L1, R2, Left, Right, Left, Right, Left, Right.

Lower Wanted Level
During gameplay press R2, R2, L1, R2, Up, Down, Up, Down, Up, Down.

More money
During gameplay press R2, R2, L1, L1, Left, Down, Right, Up, Left, Down, Rithg, Up

Tank
During gameplay press Circle, Circle, Circle, Circle, Circle, Circle, R1, L2, L1, Triangle, Circle, Triangle.

Speed up time
During gameplay press Circle, Circle, Circle, Square, Square, Square, Square, Square, L1, Triangle, Circle, Triangle.

Change outfit
During gameplay press Right, Down, Left, Up, L1, L2, Up, Left, Down, Right.

People fight each other
During gameplay press Down, Up, Left, Up, X, R1, R2, L2, L1. (Warning: Code can not be turned off, do not save)

All people hate you
During gameplay press Down, Up, Left, Up, X, R1, R2, L1, L2. (Warning: Code can not be turned off do not save)

Pedestrian Insanity
To drive the pedestrians straight out their heads, enter the following codes during gameplay: R2, R1, TRIANGLE, X, L2, L1, UP, DOWN. (Warning: Code can not be turned off do not save)

Pedestrians Fight!
To cause the pedestrians to brawl, enter the following code during gameplay: RIGHT, R2, CIRCLE, R1, L2, DOWN, L1, R1. (Warning: Code can not be turned off do not save)

Improved car handling
During gameplay press R1, L1, R2, L1, Left, R1, R1, Triangle.

Blow up all cars
During gameplay press L2, R2, L1, R1, L2, R2, Triangle, Square, Circle, Triangle, L2, L1

Clear Weather
During gameplay press L1, L2, R1, R2, R2, R1, L2, Triangle.

Foggy Weather
During gameplay press L1, L2, R1, R2, R2, R1, L2, X.

Cloudy Weather
During gameplay press L1, L2, R1, R2, R2, R1, L2, Square.

Rainy Weather
During gameplay press L1, L2, R1, R2, R2, R1, L2, Circle.

Regain health (the other way) First, get any car and drive up to a prostitute walking the streets. Stop and let her approach the car, after a few seconds of talking, she will get in. Drive to a remote sot (like a park or your hideout). Stop the car but do not get out. After a few seconds the car will start rocking back and forth. You will recover about 40 to 50 points of health. When it is over, she wil exit the car, and walk away, but not before she charges a fee. At this point you can beat her up and get your money back.

Run Faster
Repeadetly tap x. If you hold it down you will slow down. If you keep tapping you will run until u stop tapping.

Gore Mode [Submitted by: david tingay]
During gameplay press square, L1, circle, down, L1, R1,triangle, right, L1, X

Game Shark Codes
Must Be On ECB26E48 1445B464
Infinite Health 4C21D436 145625DD
Infinite Armor 4C21D43A 145625DD
Extra Money 1CC88750 17E9C70C 1CC88754 17E9C70C
Never Wanted 1CBDACF8 15F6E79D 1CBDACFC 1456E7A5
No Damage From Collisions While Driving 1C8EB5C8 15F6E79D 1C8EB5CC 1456E7A5
Firemen Don't Get Out 1C8B3B98 15F6E79D
1C8B3B9C 1456E7A5
Medics Don't Get Out 1C8B4A48 15F6E79D
1C8B4A4C 1456E7A5
Have Stick 3C21D4F8 1456E7A6
Have Handgun 3C21D40C 1456E7A7
Infinite Handgun Ammo 4C21D414 1456E788
4C21D418 1456E404
Have Uzi 3C21D420 1456E7A8
Infinite Uzi Ammo 4C21D728 1456E788 4C21D72C 1456E404
Have Shotgun 3C21D734 1456E7A1
Infinite Shotgun Ammo 4C21D740 456E788 4C21D744 1456E404
Have AK47 3C21D748 1456E7A2
Infinite Ammo AK47 4C21D750 1456E788 4C21D754 1456E404
Have Heavy Machine Gun 3C21D75C 1456E7A3
Infinite Heavy Machine Gun Ammo 4C21D764 1456E788 4C21D768 1456E404
Have Sniper Rifle 3C21D770 1456E7A4
Infinite Sniper Rifle Ammo 4C21D77C 1456E404
Have Rocket Launcher 3C21D784 1456E79D
Infinite Rockets 3C21D798 1456E79E
Have Flamethrower 4C2064D6 1456E79C
Infinite Flamethrower Ammo 4C21D7A0 1456E788 4C21D7A4 1456E788
Have Molotovs 3C21D7AC 1456E79F
Infinite Molotovs 4C21D7B8 1456E788
Have Grenades 3C21D7C0 1456E7A0
Infinite Grenades 4C21D7CC 1456E788
All Weapons Available at Safehouse * 3CC88758 1456E781

* -- Remain Outside of the Safehouse area until the pager sounds.

Hints

Get a free ride to the third island without stealing a car
When you are on the staunton island go by the bridge that leads to shoreside vale, wait for a car to come and get in the way of it,then jump on it and let it take you to shoreside vale

Tunnel under portland
coming up onto the hill where you took the guys car and had it bombed if you go very carefully of the side of the cliff with almost no speed you car will stay on the beach below. folow the mountain side all teh way around the island untill you find flatbed train cars follow their tracks through a tunnell and midway thorugh there are hobos gathered around a secret package take the packagge brutally murder the hobos with no wittnesses or reprecussions. (you can also enter the tunnel the opposite way through the back of the supper mart)

Get to Staunton Island Early
First activate the better driving code, the one where you can jump, then get a fast car and get to the broken bridge. In the corner where you cant go in, there is an opening and just drive through. (First get a fast Car) then build up speed and go all the way to then end where the bridge is broken and press L3 to jump and you should land on the other side. HAVE FUN

Steal Cars w/ alarms without Being Detected
If you want to hack a car that has an alarm get in the car, and as soon as the alarm goes on, get out of the car and wait until it turns off then go back and steal it. (It also works if you bump the car with another one)

Advance to Staunton Island
To advance from Portland to Staunton Island prematurely, go to the subway. The subway should be closed off at he bottom of the stairs. Take a car down the stairs and either crash it or park it so the door is right next to the subway door. When you open the door to get out you will step out and through the closed off gate. Then go down to to subway and get on the train. It will take you to Staunton Island. It is tricky to get your car to land near the gate but it is possible.

Get into the Prison on Level 2
On level 2 Chose a really fast car (Farriar gt) (Cop Car) and drive as fast as possible down towards the bridge that leads to the prison, jump off the bridge at you top speed and veer towards the left, once your on top off the wall jump out of your car real quick before it falls into the river. Follow the wall around to the left, you will see stairs leading down into the prison. (This will definitely take a few try's ).

Get free shot gun
Go to ammo-nation store and after you buy a gun walk up to the clerk and try to point the gun at him the best you can because you can target him, kill him, he shoots back so do it fast and after you kill him walk up to the counter and you will get his shotgun.

Secret Car
In the first part of the game in Portland you can get one of the best cars, the Banshee, -here's how. Go to 8 Ball's auto yard. Right next door is an auto dealership. In side you will see a blue sports car that looks like a dodge viper, that's it, Bullets don't work on the glass so don't bother. Steal any of the cars in the parking lot and drive it into the glass, the glass will break and then just jump in the banshee and it is now at your disposal. Note: There is a secret pack near the car.

Easy Cash
To get more cash just hit other cars with your car or mess up your car so bad that it explodes then you get extra cash.

The Hooker Cheat
This works with hookers to get your health up. Drive up to a hooker the passenger side of the car and park next to her. She will bend over and talk to you. Stay there for a while and she will get in. Then take her to a alley or a hidden place. The car will begin to shake (wonder why) and your health will go up. You will lose 1 dollar per health point. After a while she'll get out repeat the process until you have full health. This only works when cops aren't chasing you and it doesn't work when driving cop cars, semi-trucks, buses, taxis or fire trucks. So just use a normal car.

Hooker Cheat Pt2
For some real fun after she gets out get out to and kick her ass until she's dead. She drops all her money that she took from you. Hahahahahaha free money, fun and most of all free health when you do this.

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.

Easier Bosses
An easy way to take out bosses is instead of fighting them get a good car before the fight like a Hum-V or a pickup truck and just RAM them. Then they get out after there car is screwed up and just run him over. Much easier then taking him on in shooting wars.

Drive By Shootings
To do a drive by shooting hold R2 + Circle also L2 + Circle with R2 he will shoot right and L2 left. He will stick out his hand threw the window and shoot. This only works with the UZI though. Good way to take out bosses to pull up next to them and shoot the hell out of them

Be Careful
When you kill people on the street they drop money. Try and kill Hookers and the old guys because they drop the most money. Don't attack gangsters there fellow gangsters will attack you to. This includes stealing the gangsters cars.

Flamethrower Location
In Portland go to Hepburn Heights. Right next to the projects is a train platform. Jump on it and go to your left. Keep going until you reach the building that is really close to the track. You should see the flamethrower on the roof top. Jump over and get it and now you have a flamethrower.

Faster Taxis
To have faster taxis you must have 100 fares in cab game-mode. The taxis are at Borgnine in Harwood/Portland.

Police Bribe
To get the police bribe you must have 45 kills in the vigilante game mode. The bribe is in your hideout.

Stoping Car Fires [Submitted by:Chris]
When driving in any car, if it catches fire from damage, or being shot, do the health cheat. (during gameplay press R2, R2, L1, R1, L,D,R,U,L,D,R,U) and the fire will be extinguished, allowing you virtually unlimited amount of time in any car.

Stop Traffic [Submitted by:Danny Hilliard]
Do the tank cheat 30 times, then there will be no more people driving.

Free Taxi [Submitted by:Lucky Macaroni]
To get taxied around the city just jump on top of a cars bonnet then walk onto the roof. The driver won't even know your on there and will drive around the city to where ever their going.

Roam all three islands without doing any missions [Submitted by:Danny Golledge]
Enter the dodo cheat (Right,R2,Circle,R1,L2,Down,L1,R1) so that your cars can float. Then get a tank (circle *6, R1,L2,L1,Triangle,Circle,Triangle) Find a long straight road and put the cannon so it is facing behind you . Hit youre accelerator and start firing . You should take off and you will be flying . Simply fly over the water to the next island. I found this much easier than using a car across the bridge. Flying the tank is a little tricky but easy when you get the hang of it. Good luck.