Drome Racers

Unlock every tracks in arcade mode
Go to the main menu and enter:
Left, Right, Left, Right, Up, Down, Up, Down, Triangle, Triangle, X

6 cars in two-player mode:
Go to the main menu and enter:
Left, Right, Left, Right, Up, Down, Up, Down, Square, Square, X

Wire frame mode
Go to the main menu and enter:
Press Left, Right, Left, Right, Up, Down, Up, Down, Circle, Circle, X

Instant win race
Go to the main menu and enter:
Left, Right, Left, Right, Up, Down, Up, Down, Square, Triangle, Circle
After, press L3 while you play a race

Purple rain
Go to the main menu and enter:
Left, Right, Left, Right, Up, Down, Up, Down, Up, Down,
Circle, Circle, Circle

Unloc Cow
Left, Right, Left, Right, Up, Down, Up, Down, Up, Down, Up, Down,
Circle, Circle, Circle