Sony Playstation Games Solutions - One of
the Largest Games Source for PSone Cheats, PSX Codes, Hints, Tips,
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Bonus track - Enter "SENNA 1" as a name to access the "Extra Classic"
track.
Bonus karts - Finish in first place on the "Extra Classic" track to
access the first bonus kart. Use that kart to win two consecutive rounds
under championship mode to access a second bonus kart.