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Dreamcast - Shenmue cheats

Unlock "Magic waters" and "70 Person Battle" options in options menu:
Finish the game once and save the Clear Data 

Secret audio - Disc#1  Ryo talking, Disc#2 has Chai, Disc#3 Nozomi. 
Play the game disc with the Dreamcastr audio player to listen 
hidden audio.

Secret images:
If you insert your game disc into a PC CD-ROM drive, you will find 
lots of images with BMP extension in the Omake folder.