The piano has a code and I just found it : r/Undertale
Playing 'His Theme' on Undertale's Piano-Puzzle (As well as something neat I noticed.) - YouTube
Undertale Piano Puzzle - Play Undertale Piano Puzzle on Storyteller Game
Waterfall Puzzles | Undertale Wiki | Fandom
Undertale - Guide and Walkthrough - PC - By Scarlettail - GameFAQs
Piano Puzzle - Undertale Guide - IGN
Undertale Piano Puzzle Solved - YouTube
Undertale - Waterfall explored: Piano puzzle solution and Temmie Village location | Eurogamer.net
UNDERTALE Walkthrough Wiki - GameVillage
Undertale - Guide and Walkthrough - PC - By Scarlettail - GameFAQs
undertale - How do I play the haunting song? - Arqade
Piano Puzzle - Undertale Guide - IGN
Undertale Music Codes, de] but anything will work as long as it can hex-edit.
Statue and Piano Puzzle in Waterfall - Undertale - YouTube
Undertale - Waterfall explored: Piano puzzle solution and Temmie Village location | Eurogamer.net
Undertale - Waterfall explored: Piano puzzle solution and Temmie Village location | Eurogamer.net
Steam Community :: Guide :: How to complete the undertale piano puzzle
Puzzles Guide - Undertale Guide - IGN
the piano puzzle for the legendary artifact (and dog residue) says you only need to play the first 8 notes. but the statue where you get the notes only shows the first
How to Solve the Undertale Piano Music Puzzle | Piano music, Undertale, Music
Undertale - Piano puzzle solution - YouTube
UNDERTALE Collector's Edition CD Soundtrack Original Video Game Music PS4 Switch | eBay