Wreckless Cheat Codes for Gamecube

Gold rank on all missions:
Highlight the "Unlimited time" option at the main menu then press L + R + Right + Z as the game loads.

Missions A-2 to A-4:
Successfully complete mission A-1.

Missions B-2 to B-4:
Successfully complete mission B-1.

AUV:
Successfully complete mission A-9.

Dragon-SPL Car:
Successfully complete mission A-1.

Music test:
Successfully complete all twenty missions to unlock the "Music Test" selection at the options screen.

Alternate view:
Press Down to cycle through different screen effects during game play and replays. To unlock more effects, successfully complete missions A-9, A-10, B-9, and B-10.

Super Car:
Successfully complete mission B-1.

Tank-90:
Successfully complete mission B-8.

Tiger-SPL:
Successfully complete mission A-8 to unlock the car that Tiger Tagachi drives.

Yakuza Car:
Successfully complete mission B-9.