Hey there, this is the first Authors Note, but don't worry, it isn't about the story. It is about something else, to answer the question Halloween Terror had.
Undertale is a 10 dollar game on Steam. If it was a cartoon or had episodes, I would jump off the walls from excitement. If you can't get it on Steam, youtube is one way to watch the playthroughs. Jacksepticeye is one example, he played the two major endings in the game. Skydoesminecraft in real life/AKA Adam, also said that he would play Undertale soon on one of his channels. The game may not look like much at first, but the story of it is amazing. There are a Skele-ton of puns and there are also times that you want to cry from the feels. You could either go Mercy (SAVE everyone), No Mercy (Only kill those who attack you, and depending on who you kill, you'll get a different ending part thing), and Genocide (Hunt and kill everyone). The AU's are fan made alternate universes. One example is UnderSwap, where the Undertale characters switch personalities. I hope I explained the basics of it without giving away any spoilers. Have a good day, and some cookies. (::) (::) (::) (::)