Bonus cars
Win the indicated group to unlock the corresponding car:
Apachee 200X: Finals Group A
Bornbad GT90: Professionals Group B
Buster GSt: Amateurs Group B
Firespitter RS: Professionals Group A
Incubator V12: The Final Fight
Ironhorze V8: Professionals Group B
Pick'Em'Up V8: Professionals Group A
The Wrecker: Finals Group A
Bonus weapons
Win the indicated group to unlock the corresponding weapon:
Minigun: Amateurs Group B
Double Missiles: Professionals Group B
Single Missiles: Professionals Group A
Cheat Mode
Use a text editor such as Notepad to edit the "games.dbs" file in the "\atari\crashday" directory. Change the values of the "Minigun.Ammo", "Minigun.ShotsPerSec", "Minigun.TargetDamageFactor", and other lines as desired.
Mini-games
Complete the indicated division to unlock the corresponding mini-game:
Checkpoint Chase II: Final Division
Long Jump II: Amateurs Division
Vehicle Blast II: Professional Division
Win races
In a normal race (not a bomb run or a knockout race), wait for all the other cars to finish, then destroy them by shooting them or hitting their sides and then finish the race and you will win.