What's Undertale? Undertale is an RPG developed by Toby "Radiation" Fox, the guy who did a majority of the music for (ugh), Homestuck. But try not to think about that. Undertale was funded in Kickstarter back in 2013, and was finally released on Steam on September 15, 2015.
Folks across the internet have been raving about it since its release, and for good reason. The game itself is surprisingly well written (Toby thought of just about everything the player can do, and the amount of in game dialogue and easter eggs are beyond comprehension). The premise is simple, but the game is much more interesting the less you know about it going in. I'll just let the release trailer speak for what you need to know.
I've bought the game for a few folks around here with tremendous success, and I urge you all to go get the game and spread the LOVE if you can this instant! It's totally worth it.
Also make sure you tag everything game-related here with spoilers, cause god damn there's a lot of them. Don't go looking the game up on Google, you will ruin a lot of Good Things for yourself if you do. The fanbase has created a metric ton of fan works, and I'd love to be able to share them with as many people as I can here at some point.
For real just go buy the damn game already
or play the demo if you are somehow a terrible person and not convinced
Jam it back in, in the dark.