Unlock Everything:
At the main menu press and hold (in this order): L2 + L3 + R1 + Down + Square + Circle.
Unlock Extra Characters:
Beat all the tracks and win gold at the San Francisco race.
Unlock Everything:
At the main menu press and hold (in this order): L2 + L3 + R1 + Down + Square + Circle.
Unlock Extra Characters:
Beat all the tracks and win gold at the San Francisco race.