I was thinking 'hmm, why not map the Undertale boss themes?' and I thought I should do one at a time, well why not map them all! Oh and the hardest song/songs are Your Worst Nightmare and Finale, those are the Flowey fights, the songs are very hard lol, I don't like the transition between the songs in this video so I might redo this with another video that works but for now this is the video im using for easier difficultys lol.