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Playstation - Choro Q Marine Q Boat cheats

Choose same boat
Choose the "Free Run" selection at the track selection screen, 
then push Up, Up, Down, Up, X buttons on your controller.

Extra mode
Finish all the missions, win first place on all tracks, and pick up 
all stone signs from the tracks, then go to the options screen.
The "????" tab changed to "Extra mode". Select this option to 
access a "Death Fight"mode  and the extra Marinoid Bay track.