After completing the first three chapters of Story Mode, you will unlock the 'Attic' area in the twins' bedroom. This serves as a gateway to hidden tracks and higher-difficulty missions. To progress, you must collect 'Soul Shards' by achieving an 'A' rank or higher in the Music Mode stages. Using Mi-chan's 'Dream Compass' gadget will help you locate the specific notes needed to purify corrupted shards and advance the narrative.




