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Welcome to Underfell.

Play as a customizable  "Frisk" who has fallen into Mt. Ebott: a mountain that houses a kingdom of banished monsters. These monsters resent and distrust humanity, most will attack any human on sight. 

You have no way to climb back out: you can only move forward. 


The story:

Long ago, two races ruled over Earth: HUMAN and MONSTERS. One day, war broke out between the two races. After a long battle, the humans were victorious. They sealed the monsters underground with a magic spell.

This was all part of your history class.

There are multiple monster kingdoms, although only one in your country—as far as history is aware—and where exactly they are sealed no one knows. One of the many mysteries lost to time.

Or rather to war. Specifically the Great War which took its terrible toll on humanity. Since sealing the monsters centuries ago fewer and fewer humans are born with the ability to use magic. The Great War nearly wiped out the rarities that remained, and since the war, no other human has been born with the ability to use magic. 

Which is truly a shame as the world is still filled with magic. 

Humanity is coping as best can be, but it is not an easy transition. What countries remain after the Great War are largely dependent on magic; switching to an alternative power source has been a struggle. 

The last humans who can use magic are struggling to keep up with the demand, and their aging bodies only signal humanity's time limit. 

You, like most of the population, cannot use magic. 

But that’s okay!

You don’t need magic.

You have something else. Something even better.

You have you.


The romance (OPTIONAL - platonic / friendship routes are available):

  • MAJOR - Sans (M) 
    • A crass skeleton monster who replaced his funny bone with a mean bone. He (reluctantly) works as a guard for several sentry posts. 
    • Be careful if you choose to trust him.  
  • MAJOR - Papyrus (M)
    • A confident skeleton monster who strives to meet the expectations imposed upon him (several from himself).
    • He seems oddly... remorseful? 
  • MAJOR - Flowey (M)
    • An anxious flower monster who agrees to be your guide in UNDERFELL.
    • He doesn’t want to leave your side.
  • MAJOR - Entity (???)
    • 👌︎☜︎👍︎✌︎🕆︎💧︎☜︎ ✡︎⚐︎🕆︎ ✌︎☼︎☜︎ ✡︎⚐︎🕆︎
    • ✌︎☠︎👎︎ ✋︎ ✌︎💣︎ 💣︎☜︎
  • MAJOR - Harem??? 
    • ???????? 
  • MINOR - Grillby (M)
    • A fire monster you encounter at Snowdin. He's hard to forget. 
  • Possibly more if requested.  
    • Currently requested & to be added after main game is completed:
      • Mettaton
      • Undyne
      • Alphys
      • Napstablook



The credits / disclaimer: 

Underfell AU was created by Vic the Underfella and is based off of Toby Fox's Undertale. This is a work of essentially choose your own adventure fanfiction written by me (Darkpetal16).  

I just really, really wanted to play the game and I feel like it'll never happen unless I make it myself. 

This is a PACIFIST only game & is complete!


Playthrough: 

Playthrough by ★TwinklePhoenix★ on Youtube  - For those who want to listen & react alongside someone! This is a lovely first time play through. 

Harem playthrough by ★TwinklePhoenix★ on Youtube - For those who want to listen & react alongside someone! This is a fun playthrough. 

StatusReleased
PlatformsHTML5
Release date Feb 02, 2023
Rating
Rated 4.9 out of 5 stars
(359 total ratings)
AuthorDarkpetal16
GenreInteractive Fiction, Role Playing
Made withTwine
TagsCozy, cyoa, Dark Fantasy, Dating Sim, Romance, Twine, underfell, Undertale
Average sessionA few hours
LanguagesEnglish
InputsMouse, Touchscreen, Smartphone

Development log

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Comments

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Viewing most recent comments 1 to 40 of 238 · Next page · Last page

For mobile the music selection and help isn't showing up

(༎ຶ ෴ ༎ຶ) me rn because I never saved my saves to a disk (also super cool for this font to be like this (・∀・) )

But at least this is now a good reason to replay! ( ´◡‿ゝ◡`)

i dont mean to sound as if im complaining, i LOVE all your Undertale stories!! But is there a way to make this like, full screen for a phone? This new visual update is great!! But at least for me i have to put the text soze to 200% to be able to read and then i am only able to read 3 lines at a time, gods i must sound ungrateful! I dont intend to sound whiny or anything, just asking. Sorry if this comes off as rude, i respect you so much!

(+1)

Guys I need help how do I get gasters romance route because I have zero clue

(+2)

XD welp here i go again time to jump back into underfell its been a while since I yelled at UF Sans. Going to do a full revisit playthrough to think this was the first if game I played so happy to see it get a visual update. Cant wait to upload more of it to the channel  

Not gonna lie I was playing Delta traveler and one of the boss fights With Underfell sans and I was constantly yelling at him I still love him though

(+9)

Oh boy, an excuse to replay this game again! Don't mind if I do!

(+2)

Ok so, I made Shyren sing deez nuts as a joke. AND AT THE END WHEN SHE DID IT AGAIN? Freaking hilarious because I had forgotten about it. Love this game btw!! All of your games are so amazing and unique, have a great day/night, and be sure to continue with your games!

(+1)

I have never played undertale, but this game makes me want to. I got the neutral ending and actually might have teared up a little when I forgot Sans.

(+2)(-3)

I think the routes could be fixed... I mean, there could be a genocide route, or maybe while the player is on a genocide route, we could be romancing with a character. It would be fun and exciting to see! (For example: while the player is on that route, they could be romancing with Sans). And it could be improved a bit when the player reaches Snowdin and is romancing with both skeletons (Papyrus and Sans). I say this because when I did it, the route was very short and... it was something I didn't expect. But despite that, the game is entertaining!

(+2)

tbh, i would like to know what program(s) you used to make this game, not only is this one of my favourite AU games you've made and i just ADORE it but i would also like to make my own games like this too ^^ <3

(+7)

Yall I made Shyren Rick roll the entire marshlands lmaooo

(+3)

I keep playing these games every time I feel down, the writting is just so good and the story it self is so interesting, I absolutely adore your work <3

(+3)

i was never interested in undertale fan games before, the keyword being before

this is so, so beautiful, and made me cry a few times

your writing is incredible, i'll be checking out your other works (and also re-playing this one, got two routes down so far!)

(+4)

"Aishite Aishite Aishite" is a good summary of my mentality playing through.

(+2)

what does flirting with napstablook that last time do? i’ve played this a couple of times and i haven’t figured it out

(+1)

Why aren't the voices working for me :'( 

(+1)

they were removed from the game; voice actor did some ,, unsavory things

oh damn :/

(1 edit) (+1)

i love the game SO MUCH!!!!!! although im stuck on the part where you see the nice cream guy for the first time in hotland, it just wont progress no matter what i do :(

(1 edit)

Amazing game! <3 

I am so happy to see that there's so many! (Most excited to play Underswap <3)





!SORTA SPOILERS!

For the sick Papyrus bonus scene when we text WD and Sans it's bold except for WD it becomes regular italics and the text after that is bold. 

If that's intended feel free to ignore this.

(+1)(-1)

I love this game. The first time I played one of your games, I stumbled into it by accident, but they're the best thing to binge. Also, the "are you okay" was so wholesome. :)

I really like the game
Sans has been really cute
I think you done a great job each time

You're feeding the fans really well but i do have a question or two.
The audio in the game sometimes loops and i can't seem to hear the voice acting. Is there a possible solution to that?

Many thanks! I look forward to your other works and progress ⭐

help I think I’m in love w/ Grillby :(

So I usually don't leave comments/reviews on games or comics 'en things but I just cound't help it this time THIS GAME IS JUST SO AAAAAAA!!!! I'm gonna cry from excitement I just finished the game for the first time (I wasn't sure what route I was gonna do first but ended up doing gasters rote and I just turned to mush!!!) and I'm absolutely blown away by how good it is and can't wait to play more, that coupled with the fact that I've been trying to find more undertale games on itch.io too, and that I fond this game throw the tumbler blog is even better in my book, all in all this is an amazing game and I'm totally going to check out the others by the creator even if their not all completed yet!!!!!

i literally created this account so i can tell you how much i love your content and have grown up with it as time has passed. i honest to god cannot explain how much your writing means SO MUCH to me and has been one of my pillars to why i write myself. from your fics to even little gems like this, thank you for distributing your works of art.

ENDING I GOT INITIALLY - TRUE ENDING (GASTOR ROUTE) 

ENDING I SETTLED WITH - HAPPY ENDING (GASTOR ROUTE) 

because gastor never fails in making me a mess and i should've honest to god be working on my college assignments atm LMAO ♥

I can't find the stick-

You gotta leave Snowdin immediately after Sans bring you there when the game gives you the option to explore. This gives you the Greater Dog encounter which'll give you the option to get the stick when you spare em

Oh alr ! Thanks ^^

(+2)

I made an itch.io account JUST to comment on here. I. LOVE. YOUR. CONTENT!!! I got hooked immediately on your WIP Horrortale, and as soon as I finished the Ruins section, i played Siren Call to completion. Ugh, the story? The WRITING??? So much better than I could've hoped for. These interactive stories are so well-written and in-character, and as soon as I finish all the routes in Underfell, I'll be playing your other games as well. Idk what future me will think of the other games, but current me has decided that your Underfell is My New Comfort Game!!! Sure, there's a lot of death and gore, but there's something so feel-good and comforting about how you write this AU. "It's not Kill or Be Killed, it's Save or Be Saved". Beautiful!!!! That combined with the classic Undertale music, and the fact that there is no genocide route?? UGH! Instant cozy game with happy good feelings. From the bottom of my heart: thank you for making these, and I really look forward to playing the rest :)

(+1)

OH MY PINEAPPLES I’M DYING WITH LAUGHTER. HE CHOKES ON HIS DAMN CHIMICHANGA. I CAN’T-

Wait is that in the new update? I've been trying to figure out what was added.

(+1)

When you fight Papyrus, if you are on the Sans romance path and you choose the option about future in-laws then it says that someone chokes in the background. In the walkthrough it explains how the person choking is sans choking on his chimichanga.

Ha I never noticed that. That's the funniest thing ever. That means Sans was just chilling watching the fight eating a chimichanga.

Yup- Read the walkthroughs to see it-

lol i bet it was a chicken chimichanga XD

Deleted 141 days ago

Heyaaa. Idk if u still here buuut he'we go: How did u get to have the romantic route with Sans? I'ed help plzzz :(

Hooooow do I get past Toriel??? I feel like a dunce!

(+1)

Imma cry, I can't find any more games like this and now I want more of this lol

(1 edit)

this creator dose so many games like this game just check out their page by clicking on their profile :)

I already played ALL of their games :,) (I have played this one at least 4 times now lol)

ONLY 4?? I’VE PLAYED IT 17 TIMES!

(+1)

Im slowly going insane, I keep playing for Flowey :,D

Uhh,  I don’t blame ya. I might’ve replayed most of the times just for Papyrus-

i did sans, flowey/asriel, and wingding routes, my favorite one is surely wingding, even if the funnier/the one I thought it got better plot route to read is sans, especialy the hall part! Amazing bonus scenes as well for all 3 ♡

Heyaaa. Idk if u still here buuut he'we go: How did u get to have the romantic route with Sans? I'ed help plzzz :(

https://darkpetal16.itch.io/if-underfell/devlog/504345/complete-walkthrough

(+4)

"Mettaton are you going to autograph the human’s SOUL?" Literally the best line I've ever read, no notes 10/10

i adore this game sm i had so much fun playing it even tho i didnt no much. i loved exploring around even though i did die a few times beacuse of my curoisity it was worth it! and the bonus scenes (the flowey ones) were adorable.

Epik

(+1)

I stumble in from another comment section, but very much enjoyed this just as the last. one thing I loved in this one was that you made it so the game actually tracked how many times you proceeded to perish cbrought out a surprised little snort as a result. also enjoyed that when the reload happened it didn't ask me to go to my saves, and just sent me right back. just so I could add to the counter which I have no regrets.

moving on, I really enjoyed the voice acting sprinkled about. the places that they get used at really give the player a strong will to try try try again and stick it to 'em until you get everything correctly. 

though I had only romanced one skeleton man, I ended up getting one ending with a neutral end, and proceeded to spend an entire night until I got that romantic ending I so craved.

Glad ya liked the game and my performances! Was an honour voice acting for this game, its one of my favourites :D

(+2)

OMG THE VOICE ACTING IS AMAZING!!! LOVE IT !!!

And the voice acting loves you!! Glad you liked it, i worked hard teehee :>

I absolutely adored this game, one of my new favs <3

i sang welcome to the black parade with the fish. great game 1000/10

how do i get the mettaton,alphys or undyne route or is it not added yet,i'm confused as heck

Not in the game atm

(+2)

suprisingly good for an undertale VN, most of the ones you can find on itch.io are not too good. The writing is immensely good, and I love the customisation. However(and this may have just been something on my end), it felt like the game skipped MAJOR interactions, and bugged a little bit towards the end when I think it was coded to reference those interactions. Nothing game-breaking, you can still make it to the end just fine, but it does break immersion a little bit. Incas you're wondering, I think I missed out on a whole Undyne and a whole Alphys interaction. 

(+5)

aaaa i love this sm!! i pulled an all-nighter to finish it since it hooked me and was so well written I barely noticed the time past ijffvuh.

i have only placed the sans-romance route but the pet names, banter, and chemistry were so good. i was giggling and twirling a lock of my hair the whole time. 

ty for such a good game! i have been playing through some of the other ones you posted as well as the siren call game and this is my fav so far <3

so, long comment aside, tysm for such nicely written and customizable games. little me would have been ecstatic to have this in early 2018 haha. excuse my gushing ToT <3

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