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Dreamcast - Sega Marine Fishing cheats

Unlock Hideaway of Big Fish stage in original mode at the free fishing option:
Finish arcade mode once

Unlock Fishing Port stage in original mode at the free fishing option:
Finish arcade mode twice

Dogtooth Tunas cacheable in the Fishing Port stage:
Finish arcade mode 3 times

Napoleon Fish cacheable in the Corel Reef
Finish arcade mode four times