Mat Hoffman's Pro BMX - Platform: Dreamcast

Special always available 
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Pause the game, then hold L and press Left, Down, 
Y, B, Up, Left, Y, X. If you entered the code 
correctly, the pause screen will shake. 
Repeat the code to disable it. 

Extra course time 
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Pause the game, then hold L and press X, Up, B, A. 
If you entered the code correctly, the pause screen 
will shake. Repeat the code to disable it. 

Big tires 
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Pause the game, then hold L and press Down, B(2), Down. 
If you entered the code correctly, the pause screen 
will shake. Repeat the code to disable it. 

Exorcist mode
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Enable the "Big tires" code, then get over 10,000 point 
to have your rider's head spin on their shoulders.