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Playstation - Kattobi Tune cheats

Get 99,999,900 credits
Enter to the "Garage" screen in scenario mode and push the following buttons:
Up, Up, Down,  Down, Left, Right, Left, Right, Select.

Maximum character attributes
Enter to the "Garage" screen in scenario mode and push the following buttons: 
Down, Down, Up, Up, Right, Left, Right, Left, Select.

CPU control
Pause the game play, push Select, then resume the game. Your car will be 
controlled by the CPU. Re-enter the code to return to normal control.