Riviera: The Promised Land Codes -

Extra Contents options:
Collect the indicated item to unlock the corresponding option at the "Extra Contents" screen.

CG Collection: Album in Chapter 1. 
Chapter 8: Key To Hell in Chapter 5. 
Face Collection: Magic Mirror in Chapter 6. 
High Score: Valdes Scripture in Chapter 4. 
Item Manual: Item Manual from Claude after Chapter 2, and give him the correct code. 
Sound Test: Music Sheet in Chapter 4. 
Voice Collection: Spiral Shell from Reiche after Chapter 3, and give him three unidentified mushrooms.