Viewing Mod
The Binding of Undertale: The Expansion
The unofficial official add-on to the Binding of Undertale mod.
Created 3 years ago


Geez guys, 4500+ Downloads! Do I ever tell you guys how great you all are?! (Seriously though, Thanks a ton.
A SKELE-ton!


This mod is an add-on to The Binding of Undertale mod. If you haven't got that, don't use this mod.


THIS MOD WILL NOT WORK WITH THE REBIRTH VERSION OF THE BINDING OF UNDERTALE



Watch out! An Afterbirth+ Version is coming VERY soon!!





New Character - Mettaton NEO

New Rooms
- Library is now MTT resort
- Clean Bedroom is now Papyrus' Room
- Dirty Bedroom is now Sans' Room
- Shop is now Temmie Village

New Bosses
- Hush is now The Amalgamate
- Moms Heart/It Lives is now Mettaton

New Items, Such as Dog Residue, Golden Flower Tea, All the SOULS you could ever want, Riverpersons Robes, and much more!

Various Other Changes
- New Stage Transition Screen, along with a new progress bar.
- Omega Flowey floor has changed.
- And some other small things.

MOD SHOWCASES



Hutts - Lets Play:


Krakka Cafe - Item Guide (ALL items (Pre 1.4 update) Including ones from the original mod):


Krakka Cafe - Showcase of new features:




- Fix the Hush door.
- Make some Sprites look better
- Ultra Tem?




tipo19 and Opscat - Original Mod
Reddit user Draexzhan - The Amalgamate sprite
The Binding of Undertale Reddit - A few Item ideas.
Toby Fox - Undertale [And some Music too]
KrakkaCafe & Hutts - Mod Showcase
CookCannibal - White Brimstone effect
Reddit user Warhamm2000 - Some item ideas, Grillby idea/concept



PLEASE READ THIS!!!



If you happen to come across a Bug, please say
A: What Version your using (Asgore or Monsterkid version)
B: Where it happened
C: What Happened

Also, any suggestions, add them in the Comments if you like .

5609

downloads
x 650

- Fixed a bug where Anemic would make you look like Undyne

- Fixed a bug where Alphys' Lab Coat was still Rosary

- WHOOPSIE! I forgot to do a Boss Screen Sprite and name for Grillby, and also forgot to add the sprite redesigns!

- 100% more things that I forgot!

- 1.7 Changelog

- HAPPY HOLIDAYS EVERYONE, whether you celebrate Christmas, Kwanzaa, Hanukkah, anything in between or nothing at all, I hope you all have a great holiday! And as an early gift, here's the long awaited update for the mod! Yes, the last one before AB+! So, Enjoy!

- New Character: GRILLBY! Replaces Sans in the M. Kid character pack.

- Pills are now Monster Candies!

- Redesigned some sprites, by improving the shading, or outright redesigning them, such as the Gaster Blaster or Flowey's stalk.

- A few new items!

- i hAd some easter eggs from a while ago, but I dRopped them, and so i figured the best way to handle it was to just patch them back up, and now they're all Good.

- HAPPY HOLIDAYS EVERYONE, whether you celebrate Christmas, Kwanzaa, Hanukkah, anything in between or nothing at all, I hope you all have a great holiday! And as an early gift, here's the long awaited update for the mod! Yes, the last one before AB+! So, Enjoy!

- New Character: GRILLBY! Replaces Sans in the M. Kid character pack.

- Pills are now Monster Candies!

- Redesigned some sprites, by improving the shading, or outright redesigning them, such as the Gaster Blaster or Flowey's stalk.

- A few new items!

- i hAd some easter eggs from a while ago, but I dRopped them, and so i figured the best way to handle it was to just patch them back up, and now they're all Good.

- A handful of new items, some ideas courtesy of Warhamm2000!

- Brimstone is now completely white!

- Fixed Hyper Goner and Mega Satan's brimstone being red.

- It seems Gaster isn't the only mystery in this mod. Some things in this mod may get very MeT(T)a, but looking for them should be your last Resort.

- Slight patch to the fortune telling messages that's been bugging me. That's all. Last versions patch notes are below :)

- Binding of Undertale 3.5 compatability!

- Undynes eye patch has been fixed. PROPERLY THIS TIME!

- New items!

- At least 50% more temmies! (Ok, that's a lie)

- Slight UI improvements!

- Grammatical improvements!

- Absolutely no reason for my delay!

- It seems Gaster isnt the only mystery in this mod. Some things in this mod may get very Met(T)a, but looking for them should be your last Resort.

- Binding of Undertale 3.5 compatability! (ABOUT DAMN TIME)

- Undynes eye patch has been fixed. PROPERLY THIS TIME!

- New items!

- At least 50% more temmies! (Ok, that's a lie)

- Slight UI improvements!

- Grammatical improvements!

- Absolutely no reason for my delay!

- It seems Gaster isnt the only mystery in this mod. Some things in this mod may get very Met(T)a, but looking for them should be your last Resort.

- 3 New items

- Little Horn sprite fix. (He throws the resprited bombs now.)

- Removed the Optional Rooms mod. It didn't make sense to include it here. It has since become its own mod. Find it here: https://moddingofisaac.com/mod/1835/spears-rooms-mod

- Some new items. And Jerry.

- Stage Transition music no longer cuts out.

- New rooms

- Waterfall Floor fix (Hopefully. Ive tried and tried and tried to get this to work, and if it doesnt this time, oh well.)

- 2 More items.

- Various Fixes. If anything breaks, I will cry. But also fix it ASAP.

- Made a designated 'rooms' folder to make installing the rooms a bit faster. Other than that, nothing.

- Fixed Undynes double eye patch. (Finally)

- Fixed crystals being in every wall of Waterfall, and fixed the floors.

- Slight Graphical improvements

- Added a Bonus Room pack.

- 2 New Items! (Yaaaaaaaay... )

- Fixed Mettaton Neo's Stage Transition Sprite (Again)

- Buffed some characters

- Updated Cathedral Doors and Rocks

- Fixed Waterfall having crystals in every wall.

- Any maybe something else? Sorry. I forgot.

- Ok, It should work for realsies this time. Achievements should be right, and player selection should be in the all clear.

- Ok, It should work for realsies this time. Achievements should be right, and player selection should be all clear.

- New Undyne stage transition sprites

- Both versions work correctly

- Added Support for the Asgore, Toriel and Chara version. I have not tested this, so if you find a bug PLEASE let me know what it is/ what caused it.

- Slight Gaster and Undyne graphical change.

- Picking up Anemic no longer turns you into Undyne.

- New Health bar. Now you can properly tell how much health you have.

- New rocks in waterfall.

- Sans now starts with the Whoopie Cusion

- Changed some rock sprites.

- Changed the Secret room to look a tiny bit more like in the real game.

- Secret Room is now the Mysterious Place [That includes the music]

- New Item; Golden Flower Tea

- New Popato Chisps sprite

- Removed Astigmatism. I personally didnt like the sprite.

- Made the credits theme quieter.

- Fixed Mettaton NEOs stage transition sprite.

- New Title Screen

- Mettaton has had a graphical change

- Fixed the Hush Gaper texture [Not that it was noticeable]

- Temmie and Mettaton NEO now have a stage transition sprite.

- Fixed Muffets Greenish tint on the character selection screen.

Hey, sorry if I'm late to the party or simply misinterpreting, but if I use the Asgore/Toriel base version, with the expansion would I use the Asgore / Toriel folder in the expansion? Or would I use the monster kid version of the expansion and it'd give me the rest of the characters from the second version?
Is there a chance for AB+ version of this? Or this AB+ project died totally 100%?
for the time being it's on hiatus again. I have all the files but theyre not quite at the point where theyre ready for release and im not at the point where I can be bothered to finish it, sorry :\
I don't know if I am installing wrong, I start game and everything seems fine, but I start a new game and all textures are missing? I looked in files and sure enough, they are all in place as far as I could find, but everything is all screwed up and blank once I play game, help!?
Did you make sure to install the regular Binding of Undertale mod as well? You need to install that mod first, then install the expansion over top.
when is AB+ gonna come?
Undertale died 1 half year ago
"Progress has ceased. The coder I was working with is busy with other projects, and the animator I was with to help with a certain boss redesign hasn't got back to me. Granted, I could release with none of the new features, but I wanted to release with at least SOME new features, and not ones that are half baked, as both currently are."
Last hope to get the variant of the game I like back? Hate to be so impatient for something free, but how's progress? Anything anyone can contribute to help?
Progress has ceased. The coder I was working with is busy with other projects, and the animator I was with to help with a certain boss redesign hasn't got back to me. Granted, I could release with none of the new features, but I wanted to release with at least SOME new features, and not ones that are half baked, as both currently are.
Is the AB+ version you're working on going to include the same starting items instead of just swapping character appearances? Incredible job on the mod btw.
i have a little problem, i dont have mettaton NEO, i have the asgoreĀ“s version, i install the expansion and in one second open the game, and no mettaton neo
how do I use it? do I use the original mod as well?
oh no, not maybe. Definitely. It's almost ready, just gotta get 2 items coded, and finish off the new sprite for one of the bosses.
What do you mean 'Basic Download'?

If you mean the original mod it's here

Otherwise, just click that big green download button above the Version History heading.
i mean on the acutal mod theres a basic download
I'm sorry, I have no idea what you mean. Could you try and explain a little clearer?
i think they meant the asgore, toriel and chara
not yet, only for Afterbirth, but it's coming, I swear!
For some reason, when i start a game all of the characters have their base game starting items e.g toriel (eve) has WoB and dead bird instead of fire mind. I've tried uninstalling and reinstalling but nothing seems to work do you know how i can fix this?
I can't get Chara or Neo
If Neo is a special condition like Undying then please tell me
beat It Lives 12 times or something to unlock Chara, and NEO requires you to pick up Judas' Shadow/ The Power of NEO (I think Mettaton may start with it)
Oooohhhh I get it now, unlock requirements, makes sense.
Still, there is no locked character icon for Chara, is that intentional or just a bug??
intentional. ??? doesn't appear on the character select screen until he's unlocked.
You forgot credit me where grillby.
Oops, sorry, my bad, will fix right away!
"Reddit user Warhamm2000 - Some item ideas, Grillby idea/concept" it's right there under Special Thanks
if anything i should be thanking him :P
are you ever goging to make a update for afterbirth +
still waiting on some art and coding to be done, then it'll be out
still waiting on some art to be done
June 5, 2018 - 5 months ago

The download button will now give additional details and link to a helpful announcement when you have not been verified as owning the game.