Try entering the following codes if you need help in the game. To enter them select '1-Player' and 'New Career' and at the 'Enter Name' screen input the code you want to activate and press X to confirm. At the next stage you can choose 'Quit Career' and the code will still remain enabled.

Unlock ALL Tracks:
Enter the code CAPBLI

Higher Gravity:
Enter the code BURDEN

Lower Gravity:
Enter the code FLYHIGH

Unlock Semi Pro Class:
Enter the code MICKEY

Unlock Semi Pro and Professional Classes:
Enter the code WOLFMAN

No Collisions with other Vehicles:
Enter the code GASTLY

Star at Final race in Career Moe (Amateur Class) with 500 Points:
Enter the code DCSPER

Star at Final race in Career Moe (Semi Pro Class) with 800 Points:
Enter the code STRIDER

Star at Final race in Career Moe (Proessional Class) with 1,200 Points:
Enter the code WIPEOUT