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Dreamcast - Illbleed cheats

Unlock Mini-game
Highlight the "Options" at the main menu after press the following 
button combinations: A + X

Eriko in her underwear
If you do not rescue anyone and you lose all of your friends during 
gameplay, when you reach Level 6, Eriko will wear underwear.

Diferent endings:
Ending 1. - Save all friends,
Ending 2. - Save just one friend
Ending 3. - Saving no friends.