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Codes

_boa - Access to all the craft
_qak - All craft become ducks
hurr - Get the new and fast hurrican craft
frac - Fractal Generator, this allows you to make your own courses
_day - Makes all the day tracks accessible
_nit - Makes all the night tracks available
rrim - Makes all the mirror tracks available to race
Winr - Whenever you quit a race, you automatically win it

More Cheats

Input the following cheats on the name selection screen in one-player mode before they become available in the other game modes

Day Track Select

D__# (_ = Space)
Where # equals the number of the track you want

Night Track Select

N__#
Where # equals the number of the track you want

Mirrored Track Select

M__#
Where # equals the number of the track you want

Porsche Mode

BXTR
This enables the Porsche cheat, but it only works if you load in a "Rapid Racer" saved game from a memory card that also contains a"Porsche Challenge" saved game.