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Dreamcast - Daytona USA cheats

Unlock Unicorn car
Finish the championship mode

Unlock Pywackett Barchetta car
Play in single race mode and finish in any position on the 777 
speedway track with all teh following cars:
Falcon, Hornet, Grasshopper and Lightning cars

Unlock Pywackett Barchetta Super car
Select the Pywackett Barchetta car after unlocked, play on any track, and
modify the laps number to two. When the race beign, turn your car, go backward
and drive the entire race in reverse mode.

Unlock Rule of the 9th car
Play in single race mode, and reach the track records on every 
8 mirror reverse tracks

Red Cat car
Win a race online
or
play with the game at least 20 hours.

Unlock Javelin car
Play with the game more than 100 hour