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
Undertale - Flower puzzle Solution! - YouTube
Undertale Part #14 - Waterfall
Undertale Part #14 - Waterfall
Undertale Waterfall dark room map - Imgur
1.8] Undertale - Waterfall Minecraft Map
Comprehensive Undertale Piano Puzzle Guide - Indie Game Culture