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Nintendo DS - Cars cheats

Secret Music Track for Romones Style:
Press Up, Down, Up, Down, A, B, X, Y  on Start Screen for extra song.

Unlock All cars:
Press Up, Up, Down, Down, Left, Right, Left, Right, B, A, B at 
the Press Start screen.

Pistons Cup Shortcut:
When you almost complete the final lap, jump just before the finish line.