The Extras unlock based on flags triggered in your save file.
Located in the attic during Chapter 4. You must click the small sparkling icon behind the piano. Melody Walkthrough Guide -v1.00 Extras-
If your Extras menu is currently greyed out, you likely missed one of these three triggers: The Extras unlock based on flags triggered in your save file
I can provide the or item coordinates to help you finish the guide! Melody Walkthrough Guide -v1.00 Extras-
