Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsSpoilers: This covers the Library’s second bookshelf puzzle and its optional chest route. For the main route, play pink: left, down, right, up; green: left, up, right; then pink: down, left, up, right.
How the pink and green piano works
The puzzle is the second bookshelf-pushing puzzle in the Library. The piano has two octaves: pink moves the pink bookshelf, and green moves the green bookshelf. Press MENU to switch octaves before entering the next part of a sequence. The order of the inputs matters, so check the active octave at each color change.
![DELTARUNE Chapters 3+4 Piano Score - Sheet Music from game DELTARUNE, Chapters 3 and 4 [Perfect Paperback] Toby Fox and Sydney Kjerstad](https://m.media-amazon.com/images/I/31+tFJZZkGL._SL160_.jpg)
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Main route: fill the marked squares
To open the progression route, enter these three segments in order:
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- Pink octave: left, down, right, up.
- Green octave: left, up, right.
- Pink octave: down, left, up, right.
Switch octaves with MENU between segments. If a bookshelf moves unexpectedly, check that you selected the matching color octave before pressing a direction.
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Optional ReviveMint chest route
The chest requires a different sequence from the main marked-square route. Use:
- Pink octave: left, down, right, up.
- Green octave: left, up, right, down.
- Pink octave: down.
The green segment includes an extra down input, and the final pink segment is only down. Do not use the main route’s final pink sequence when aiming for the chest.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which sequence should you use?
| Goal | Pink opening | Green segment | Pink ending |
|---|---|---|---|
| Progression route | Left, down, right, up | Left, up, right | Down, left, up, right |
| Optional ReviveMint chest | Left, down, right, up | Left, up, right, down | Down |
These directions apply to the Library bookshelf puzzle, not other piano puzzles in Chapter Four. A walkthrough for the [Chapter 4 puzzles] identifies this as a two-octave bookshelf mechanic; a six-color melody answer found elsewhere does not describe this puzzle.
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