GT Championship - Platform: Gameboy Advance

Unlock All Cars Quickly:
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To unlock a car you must have started a race with it in championship
mode. But instead of going through all 22 cars, save the game when 
the season ends and the next time you load a new season starts. Pick 
a car to go into race 1 then quit. The car is now unlocked. 
Keep doing this for every car and then of every season. 

Mirrored Tracks:
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Successfully complete championship after unlocking all 22 cars to unlock 
mirrored tracks.