To unlock the sports car and race car, complete a case.

To unlock the Code 9807 case, complete all cases on Hard.

To unlock all tracks, complete all cases and Code 9807 on Hard.

Activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
All cars - fullgarage
All tracks - wantstreets
Repair car; will repair all cars in split-screen mode - adac
Indestructible car - useshell
Double weapon range, faster and automatic firing - eatlead
Unlimited nitrous - needspeed
Exploding traffic - goaway
Disable automatic roll back onto track - wannago
Unlimited wins in Patrol and single race
modes (not split-screen) for ten seconds. - johnwayne

Choose split screen mode and enter Cheater as a name for player one and "High End" as a name for player two. Press ENTER then continue to press ENTER at the remaining prompts. Then, press ESC and go to single race mode. Select a car and you will will race a truck.

To unlock File mode, complete a case on Normal or higher. In File mode, you can replay a previously completed mission on a case.