Speed mode
Press L1, L2, R1, R2, Square(2x's) when your at the title screen.

$25,000
Pause your game and press L2, Square, R1, Square, R1, L1, Circle, L2, Square, R2, Square, R1.

Slow motion mode
Press L1, L2, R1, R2, Square, Circle when your at the title screen.

Every truck
Press L1, L2, R1, R2, L1, R1 when your at the title screen.

Costa Rica Rally: Treasure chest
From the start, proceed east until you come to a temple. This where you can find a treasure chest. If you cannot locate the temple, go to the contour map and look for a tiny light gray area.

Crazy 2001: Treasure chest
Proceed to the southwest corner of the lake close to the start to locate a treasure chest with money.

Autumn Leaves: Treasure chest
When you are at the start of the level, follow the road until you come to a church. Behind it you will find a treasure chest.

Castle Rock: Treasure chest
Go back roughly 100 feet from where you first started. There should be a skeleton there guarding a treasure chest.

Laguna del Sol: Treasure chest
After you pass Checkpoint 3, drive onto the huge island straight ahead of the checkpoint to locate a treasure chest.

Pikes Peak: Treasure chest
Proceed to the lake that is the furthest from the end of the track. The treasure chest can be located on the land between the lakes.

Arctic Wasteland: Treasure chest
From the start, go north until you almost get to the water. Then, head east. Then follow the water for a short distance until it ends, then head north. Now go north until you see the American flag and a building inside a fenced in area. The treasure chest is in here.

Arizona: Treasure chest
When you are at the start of the level while in roaming or racing mode, proceed in reverse until you pass the train tracks. Then, go to the right until you come to a derailed train. Stop at the front of the train then go right until you come to a canyon with a piece of road and two hills in the center. In between the two hills are two tiny houses. The treasure chest is inbetween the houses.

Farm Road 109: Shortcut
When you are trying to use the shortcut across the railroad tracks, it is best to use the Jeep Liberty Sport. It can usually get across before the train crosses if you approach from the right side of the tracks.

Farm Road 109: Treasure chest
The treasure chest is posistioned at the center of the lake.

Treasure Bay: Treasure chest
From where you start, follow the road until you come across a ship on the beach. Then go to the side of the ship where the sign is on the beach. The treasure chest is on that side of the ship. Note: You can only obtain the treasure chest by driving your truck beside the ship. Just start towards the back of the ship, facing the front. Drive really slow to get the treasure chest.

Tri Baja 250: Treasure Chest
From where you start, follow the track in the same direction as if you were racing until you come to the bridge you drive on. The treasure chest is underneath this bridge.

Restricted Area: Treasure chest
Locate the hanger with the UFO inside then proceed to one of the corners to locate a treasure chest with money.

Thailand Rally: Treasure chest
Pause the game while playing and go to the contour map. Then go to the bottom right corner of the map and press R1 until the map has stopped. Then just to the left of the island is a brown spot. That is the Temple Of The Dancing Buddha, which is where a treasure chest is at.