At the Main Menu (the screen with Start Game and DVD Options), hold L and R and press Y, Y, RIGHT, Y, Y, DOWN, A, A, LEFT, A, A, UP. Release L and R and a sound will confirm the right code has been done correctly.

To play as DJ Mix Master Mike, go to the main title screen. Press and hold L and R, then press A, A, RIGHT, A, A, DOWN, A, A, LEFT, A, A, UP. Then select any character and he/she will be replaced by Mix Master Mike when the level begins.

To unlock the Pipe Dreams track, get a Medal in all of the previous Showoff levels.

Riders are unlocked in the game by completing the following tasks: Brodi: Win one Gold Medal in World Circuit.
Zoe: Win two Gold Medals in World Circuit.
JP: Win three Gold Medals in World Circuit.
Kaori: Win four Gold Medals in World Circuit.
Psymon: Win five Gold Medals in World Circuit.
Seeah: Win six Gold Medals in World Circuit.
Luther: Win seven Gold Medals in World Circuit.

To unlock the free-form, powder-rich Untracked level, get a Medal in all of the previous Race levels.