In-game reset
Press [Select] + [Start] + [R1] + [R2]
+ [L1] + [L2] during game play.
Hidden shop
Successfully complete level 6 in story mode, then select
the top right corner of the screen.
If you finish stage 7, go up to the mountains. When you get stuck,
press [Circle]. You will be in a new shop. Its a normal shop,
but when you go to the gear ratio section you will see something
worth 30,000. Its is an object that makes your car go top speed.
Phantom-Blade car
Successfully complete story mode with Knuckle Breaker.
Then, defeat the Phantom-Blade car in the next challenge to make
that vehicle selectable.
Ray Stinger car
Successfully complete story mode with Fire Stinger
and wait until the ending sequence completes. Restart the game
and select the option under "Continue" to start a Ray
Stinger versus Fire Stinger challenge. Defeat the Ray Stinger
to make that vehicle selectable.