Resident Evil Village – How to Solve Piano Puzzle
When you first enter the Opera Hall, you will find a grand piano in the center of the room. A small hidden compartment just above the keys of the grand piano contains the Iron Insignia Key.
To access this compartment and obtain the key, you need to play the correct notes on the piano as indicated on a piece of paper. The puzzle is quite simple, as it only requires you to play the notes highlighted in yellow. Each time you play the correct note, the sequence will advance to the next.
There is no way to fail this puzzle; even if you get a note wrong, you can continue searching for the next correct note. You can try all the keys if you want to find the right note, as the puzzle will not reset if you play an incorrect note.
Once you have played all the notes from left to right, the piano will open the small compartment and slide out the Iron Insignia Key for you to collect. This key is necessary for the Hall of Pleasure, where you need to obtain the Azure Ring Key. Acquiring it is essential for the story progression of the game.