Semi Frequent Undertale Facts on Twitter: "* The sign in the Piano Room in Waterfall stays that "only the first 8 are fine" but you only need to play 7 notes. Submitted
Waterfall Puzzles | Undertale Wiki | Fandom
Undertale - Waterfall explored: Piano puzzle solution and Temmie Village location | Eurogamer.net
Undertale Piano With the Great Treasure - YouTube
Undertale. secret Piano room by Vioarry on DeviantArt
Statue and Piano Puzzle in Waterfall - Undertale - YouTube
Waterfall Puzzles | Undertale Wiki | Fandom
Undertale - Waterfall explored: Piano puzzle solution and Temmie Village location | Eurogamer.net