Invisibility
Pause the game and press R1, L1(2), R2, L1(2), L2. If you entered the code correctly, you will hear a sound.

Lighter cars
Pause the game and press L1, R1(2), L2, R2(2). If you entered the code correctly, you will hear a sound.

No gravity
Pause the game and press R1, R2, R1, R2, Up(3). If you entered the code correctly, you will hear a sound.

Increase time warp
Pause the game and press R1, L1, L2, R2, Right(3). If you entered the code correctly, you will hear a sound.

Decrease time warp
Pause the game and press R2, L2, L1, R1, Left(3). If you entered the code correctly, you will hear a sound.

Use vehicles from Midnight Club: Street Racing
Insert a memory card with a saved game from Midnight Club: Street Racing to use vehicles from that game.

Easy Money
Pick "Turf War." Then go to loot grab. Then pick the forest level, go below that and pick the "Cookie Toss" mission. When you get your "contraband" Since there are only three places where the "contraband" will be. Go up the hill in front of where you pick up the stolen goodies. There should be a dirt path, follow that, until you get to where you have to drop the "contraband" off. Then jump off making sure that you jump over the red or blue flare. That's how you save money!

Hidden Tunnels:
From where you start, drive over the sand dunes in the desert level until you are in plain view of the windmills. Drive over the hills and you will see a long dirt road.Follow the road towards the 1st border check point. Keep driving until you pass the antique post office and a small group of hitchikers.

The end of the road should be near, find then end and take a right. "4-Wheel" through the mirage pond until you see a oval tunnel. Drive through that tunnel, and you will end up in a "ghost valley", then follow the dirt tracks until you get to another tunnel but do NOT go into it.

Instead, take a right up a steep hill. Once at the peak of that hill, go under the boulders located to your right, and follow the road that leads to a pit. Drive off into the pit, and you`ll find another hidden tunnel. Go into the tunnel and you will now end up in another giant dark pit! Go into the new pit and you`ll notice ANOTHER hidden tunnel.

You can either drive into the tunnel and take a gigantic flying dive directly over the post office or you can come out the other end and be launched 50 feet into the air! This is where you can climb the side of the mountainous hill to get to the top of the desert mountains. Just use make sure you use the Hummer, since it can climb large objects.

Once your on top of the mountain, you will see that it is the highest point in the level, allowing you to see everything there is. You will also notice a black wall that is the end of the map! There are plenty of traps, so be careful! Enjoy the view!

Desert Level Hidden Tunnels
    (also highest point)(Joy ride)(Military vehicle recommended)
From where you start, drive over the hills where you see the windmills....go over the hills and you will see a road...follow the road towards the border check point....follow the road as it pasts the post office and a couple of backpackers....follow the road till it ends and take a right....drive through the dried up pond until you see a tunnel....drive through the tunnel and you will end up in a "valley" follow the dirt tracks until you get to another tunnel but don't go into it, instead take a right up a steep hill...once your at the top, go under the boulders and follow the road that leads to a "pit"...drive off into the pit and you'll see a hidden tunnel...drive through the tunnel and you will end up in another "pit" drive into the pit and you'll notice another hidden tunnel....you can go into the tunnel and take a serious dive right over the post office (the one you past on your way here) or....you can stay in the "pit".. c! ause this is where you can climb the side to get to the "top" of the desert mountains...trust me on this....there is a way to get up there...just use a car that is strong (ie)The Hummer. Once your up there you'll notice a black wall...thats the end of the map! you will also notice there are a lot of traps up there so be careful.. Notice how high you are!!!!

Desert level Hidden area
Go to the bottom of the staircase (has a stone bridge over it), drive up the staircase, make a sharp left after passing under the stone bridge. continue around to the left and climb the hill. You should be able to drive up and on top of the stone bridge, use a strong car. Cross the bridge, Carefully! You will enter a small dune area and a trench that goes pretty far. It will drop you into the snake like dune area.

Another cool spot is the Massive jump.
It is located by the telephone poles, up against the canyon walls. The best way to describe the area is that its almost the complete opposite side of the world that you start on in free ride mode. There is a hidden road that will climb pretty high up, follow this to a huge pit area with a big ass jump in it.