Undertale - Mettaton Color Tile Puzzle - Completed - YouTube
Making the Undertale Tile Puzzle - YouTube
Semi Frequent Undertale Facts on Twitter: "* During Mettaton's Tile Puzzle, he mentions if you walk on a green tile you'll have to fight a monster, if you never walk on one
Mettaton was present since we meet Sans and Papyrus? : r/Undertale