Hint: Quick Start 
     When  the  timer  is  about to display GO, quickly tap B to brake
then  hammer  down  A  to  accelerate.  This it very tricky, but works
wonders if you do it right.

Unlock Cheat Mode Menu 
     Unlock  any  cheat  and the Cheat Mode menu option will appear on
the options screen.
 
Unlock Custom Series Championship 
     Earn  gold medals in every race and complete Championship Mode to
unlock Custom Series Championship.
 
Unlock Freerun 
     Finish  Custom  Series Championship to unlock Freerun Mode in the
Cheat Menu.
 
Unlock Invulnerability Option 
     Finish  the  Grand  Prix Championships with gold medals to unlock
this option in the Cheat Mode menu.
 
Unlock New Cars 
     To unlock the cars below, complete the corresponding goals:
     - Custom Compact: Beat Custom Series Qualifier. 
     - Custom Coupe: Get all gold medals at Split Second Grand Prix. 
     - Custom Muscle Car: Beat Pursuit 6. 
     - Custom Pickup Truck: Beat Pursuit 5. 
     - Custom Roadster: Get all gold medals
       at the Point Of Impact Grand Prix. 
     - Custom Sports Car: Get all gold medals
       at the Speed Streak Grand Prix. 
     - Custom SUV: Beat Pursuit 4. 
     - Classic 1970 Car: Destroy the car with a police car
       in Pursuit 2. 
     - Drivers' Ed Car: Get all gold medals in Driving 101. 
     - Gangster Car: Beat Pursuit 3. 
     - Hot Rod Car: Beat Face Off 1. 
     - Japanese Muscle Car: Beat Face Off 2. 
     - Oval Racer: Beat the car in Face Off 2. 
     - Polic Car: Beat Pursuit 1 and destroy the villain's car. 
     - Super Car: Beat Face Off 4. 
 
Unlock Runaway Mode 
     Finish  Crash  mode  with  Gold  Medals  in all the challenges to
unlock Runaway Mode in the Cheat menu.