Speed Racer [cheats]
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Place first on all three tracks to gain the Fire Ant and Samurai cars.
To get Racer X's Shooting Star, beat all tracks on endurance.
To get the Demon car, beat the time trial with the Shooting Star.
To get the ultimate GRX, take the Demon car into the hidden tunnel shortcut, hit and remove all pillars, activate C and D, and hit the tomb wall to the left.