Go into the Simpson's House, there is a place you can jump out of in Barts room, jump out, and you go outside. There should be a rocket car there, or near it. Get in, and drive to the City. Theres these bee things there, kill them, and the items they drop. They're all over the town, once you kill them all, you'll get a message. I won't ruin what you get, but it's fun. Just don't run over people going there, the cops will get you.

To get these 2 cars on level 3 buy them by the big boat where milhouse is

OK here's some help:

Secret car on 1st lvl= Parked beside a row of posh houses (Near that building shaped like a ramp).

Secret car on 2nd lvl= On the monorail track (Go up some stairs and your there)

Secret car on 3rd lvl= In a big open crate (On the giant ship)

Secret car on 4th lvl= Parked in between two trailers (In the trailer park)

Secret car on 5th lvl= Where the big fountain was on the 2nd lvl.

Secret car on 6th lvl= Half-buried in the purple building on the pier.

Secret car on 7th lvl= Ontop of Krustyburger.

Here I have logged some cheats:
Jumping car cheat: [], [], [], X []=square O=circle /\=triangle
Invincible car cheat: /\, X, /\, X
Super speed car cheat: /\, /\, /\, /\
????????????????: /\, O, /\, O

To jump with car after using the cheat, press L3.

The Action Replay cheats for this game are awesome!

For this to work you must have the destroy cars in one hit and infinite car health.Ok go to an area with a bunch of cars,now jus destroy them.WARNING, when the cops are chasing you, do not stop or you will pay literaly

I will start by saying that skipping missions is lazy! The point of the game is to play the missions! The missions are the game if you skip them please go back to them you will find it says you haven't completed them if you skip them, therefore you haven't completed the game!

Anyway moan over...I'll tell where the bonus cars are on each levels:

Level 1 bonus car: Rocket car (located near Mayor Quimbys house)

Level 2 bonus car: (un-known) Maybe Monster truck near where Professor Frink is (?)

Level 3 bonus car: Speed boat (located on the Ship Bart is on in a massive crate)

Level 4 bonus car: Quad bike ( located behind a caravan in the caravan park near Cletus' shack)

Level 5 bonus car: (?) Not sure

Level 6 bonus car: Pink cadalac (located in side of building next to planet Hype you have to look up)

Level 7 bonus car: Remote controlled car (Located on the roof of the Krusty burger)(name may be different as it's halloween)

Next I shall tell you about a glitch:

In Liza's Level there is a house oposite the big ship which bart is on. The house has a sign on the sign has the word hamper in it. Next to the house there are some crates. There is a chain; jump on the chain and jump round the crates. Now you can walk through the wall and go inside the house. (if you use the cheat for jump with horn you can get through with the hover bike)

Also if you use the jump with horn cheat drive really fast towards the light house and clik L3 (when cheat enabled) and the car will jump and land on the sea. Now your driving on the sea class or what! To get back to land turn round and there will be a black square floating in the air drive into it and you will go back to land!

Hoped I helped back soon (finding more out)
Good Luck gamers!!!!
X-James-x

Ok first put on the car invincibillity cheat /\, x, /\, x also put on blow up cars on impact cheat [ ], [ ], /\, /\ or /\, /\, [ ], [ ] I don't know which one but it's one of them then once there on start hitting cars because when they blow up you get like 20 $ or more...... and ya the fuzz is going to come a lot but dodge them or let them hit you they'll blow up also now everytime I go in a level i can buy all the cars and clothing 4 the person ***ALSO*** this is really really helpful in races because you just have 2 hit the other guy then there no challenge!!! hope this helps a lot!!!!

Crazy Kitty

Ok, first get any kind of vehicle and drive it into the power plant not outside because the doors close and you can't go in then next keep on hitting carl inside the power plant.

Once you're fully inside talk 2 him when you talk you will be outside but when you start you will be inside the power plant then just easily drive to the mansion or you can always put on the hit cars.... then they blow up.

Cheat... then hit mr smithers car and hes just there... Free way to the mansion... this also helps with any kind of race and also if you hit lots of cars you get money, so you can also buy all the outfits too!!!

Hope I helped !!!!

Crazy kitty

Ok, you have to be in bart's level with the giant jump and the building in front of it and also put in square x 3, triangle now to the thing so when you're at the jump back up till there´s something in the way.

Get a fast car, but make it so the top is smoking black or light black and go full speed at the jump then right before you go off press l3 to make the car jump really far.

You will most likely hit a building and the car will start on fire then you're guy jumps out and hes like 100 feet in the air then he jus falls and it's funny!!!!!!

All you need to do is before puting the disc in the machine go on system configuration and put the date as the 25th of december and then it should come up as homer in a santa costume!

Now, to those of you who are confused with barts second vehicle please read carefully. The pink oceanic car that bart has is stuck inside the front wall of the building called planet hype.

It is not ON the logo planet hype it is on the building attached to it.

Next to that thing that looks like the ifle tower on top of the building go right to the edge facing the entrance to the squidport and position the camera so it is looking at the front wall and in front of bart.

There should be half of a pink car stuck outside the wall. Jump down and land on top of it, enter the car reverse out of the crack and drive wherever you need to go.

Repeat this again if you missed it, you'll get it eventually : )
Later.

N.B.: This is a HINT not a cheat, this method still requires work!

To make 100%-ing the game easier, play through the entire game and get to know where everything is.

Then restart your game (you can keep your old save if you wish) then, before the first mission of each level complete a `lap` of the level.

(levels are in kind of a circuit) Make sure you go everywhere and do everything! OOnce you have completed the `lap` check your level progress.

If it isnt full marks (eg. 7/7) for everything apart from the story missions, try again.

I find this much easier than trying to remember where things are and search later in the game.

Hyrule...

If your having trouble getting all of the flat meat in time, what I did was always look at my radar this helps as it shows you the position of the meat and shows you sneaky shortcuts

When you put in the fastest cars cheat on homers 1st level and you are driving the rocket car, you may go right through walls....

Do you know that stupid cheat XOXO and then you get all the cars you will ever want on the game...

Well do you know what, it is not true, I think it is a load of rubbish

Go into options-menu and press R1 and L1.

While doing this enter

circle,circle,circle,x:
diferrent camera

rectangle,rectangle,rectangle,rectangle:
faster car

triangle,triangle,triangle,triangle:
much faster cars

triabgle,x,triangle,x:
undistroyable car

triangle,triangle,circle,rectangle:
show speedometer

triangle,circle,triangle,circle:
different view

Note: Each level has its very own secret car. For the car to be one of the secret cars it must be unique.

This means that there is only one of that kind throughout the whole game, Noone can drive it except your game character, and it is not found being driven on the road. Each level only has one secret car.

P.S.- If you know where any of the missing cars are, please submit the location.

SECRET CARS......

Level 1:(Missile Durby Race Car)Located infront of a gold mansion in the rich part of springfield-you can't miss it.

Level 2:(Monorail)Located in downtown Springfield. Right after you get off the highway you will see some steps with caution tape over the entrance.

Jump over the tape and go up the steps. Go to the far end of the platform and use the yellow overhead light to jump to the monorail.

Level 3:(Speed Boat Car)Located ontop of the big boat inside the top box of a pile of big green boxes. There is a little stack of boxes behind the green ones that help you get up.

Level 4:(Not Found)

Level 5:(Monster Truck - Obliteratatron)Located on a ledge next to the Springfield Stadium. Use the fountain to jump to it.

Level 6:(Not Found)

Level 7:(Mini Toy Race Car)Located ontop of a building behind the "Spook-E-Mart"(Kwik-E-Mart).

You can either use the fire truck ramp and land on the building or you can use the other firetruck's ladder to boost you onto the roof.

There was this guy named Alex 4000 that said in lisas level the secret car was principal skinners car, well he was dead wrong the secret car there is a boat that can't go on water.

To get this boat you must go on the bigger boat the one where you find bart it's called the c-spanker or something like that.

Well anyways, to get on that boat which im sure most you no is there is a ramp leading to an opening in th boat so just follow that path in the boat untill there is a wall infront of you.

Get out of your car and and hop up to the maine deck in about the middle of the boat you will see wooden boxes, hop up those and you will see I guess what you would call a secret room it has a boat in it.
ps. oh, and remember it can't go in water.

To drive a quad u will have to be marge.

The quad is near cletuses house in the caravan park its blue and has a good suspention so put in the jump cheat and look at the suspention.

(note this can only be used if you are marge).

If you are a bad driver and you're always crashing your car and crashing into walls etc. then it's easy!

When another car/van stops at a traffic light or whenever it stops, quickly double-jump on top of the vehicle and stay put on top of it. It will keep stopping to let you off but just keep going.

Eventually it will take you at the place where you began your mission i.e. talk to Marge or someone. So just jump off or walk off. So in the end you will be safe and sound and you won't crash anything!

To Get the Itchy and Scratchy Cel Card, First make sure you have the Armored Car (Get from Gill 400 coins) Drive to the Duff Blimp and park the armored car under the card.

Get out of the car and get on the roof of the car. double jump and grab the card.

SIMPLE!