You can try out the greatest rap fight of all time. Huggy Wuggy from Poppy Playtime is in this Five Nights at Funkin' mod.
No matter what song he gives you, you have to beat Huggy Wuggy.
You can do this in both the story mode and the free-play mode. The only way to win is to get to the end of the songs, which you can only do if you play all your notes correctly.
Have fun and good luck!