
FATACLYSM
A downloadable game
Enter the Excessive Expanse and experience the FATACLYSM - a multiversal calamity that has brought together disparate fragments of space and time to a realm of expansive proportion. Take the reins of a group of unfortunate heroes who have committed themselves to escaping the Expanse, no matter how many tries it takes... even if it costs them their waistlines over, and over, and over again.
FATACLYSM is a roguelite made in Twine that focuses on the struggles of a party of four women as they venture through a realm comprised of many different settings and times, hellbent on fattening them up by any means necessary. Fortunately for them, though, the power of the Excessive Expanse is a double-edged sword. Combat in FATACLYSM involves no normal health points, no real damage, and no silly unfattenable enemies. It only involves what really matters - girls getting bigger. All damage dealt in the Expanse, without exception, is always converted to fat.
No combatant is ever safe from the fattening grasp of the Expanse, and our heroes must do everything it takes to make sure that they're not the ones on the receiving end. That is... unless they want to be. As a roguelite, players are free to succumb to the Expanse as much as they want in FATACLYSM, and are always able to continue their journey in the future. Through their failures, though, the protagonists of FATACLYSM only grow stronger, and their capacity to get progressively bigger and bigger can only increase as they harness the weighty power of the Expanse.
Actually traversing the Excessive Expanse entails delving through vastly different layers, crawling with fattening challenges of all kind. From tactical, turn-based combat to juicy narration-based events, both accompanied by a wide array of (highly customizable) fatty sound effects, FATACLYSM presents a plethora of ways in which players can lose themselves in its world. Characters may even be brought towards an untimely, immobilizing end depicted in lengthy, descriptive defeat scenes, all of which are easily re-viewable in the game's image, event, and ending gallery. There is no overly punishing, permanent loss condition, though! The heroes can never truly be defeated in a roguelite, after all.
The Expanse also offers multiple unique settings within its respective layers, with more to come in the future. FATACLYSM currently contains two fully fleshed out areas:
THE PENITENTIARY - A futuristic prison complex, constructed with the singular goal of fattening its inmates and keeping them as nothing more than massive, flabby batteries for the rest of their miserable existences. Ruled by a cruel, iron-fisted sadist, the neon-horned Warden of the Penitentiary wants nothing more than to keep each and every member of the party locked up as her personal, blobby playthings.
THE PALACE - A lavish castle of flowing red silks and golden chandeliers, this fantastical locale of swords and sorcery holds a plethora of regal buffets, alchemical attractions, and supernatural horrors. Though the opponents of the Palace's ruler may see her as a tyrannical, hedonistic layabout, the Sovereign's keen ability to soften the disposition of others and intoxicate them with her own way of life is second to none.
https://www.patreon.com/jupitarian
https://subscribestar.adult/jupitarian
If you just want to download the free version, though, here's all of the content that you can expect:
- The full intro of FATACLYSM, along with all of the weight gain sequences and images it holds
- Access to layer 1 of the Expanse, the Penitentiary
- NEW - Access to layer 2 of the Expanse, the Palace!
- 6/8 weight stages for each party member
- 11 Events
- 15 unique Enemies
- 5 highly descriptive Endings, each containing various unique images for party members
- A wide range of fat-related sound effects, accompanied by a full OST
However, by supporting me on Patreon, not only will you be contributing to the continued development of FATACLYSM, you'll also be unlocking the following content to play immediately:
- The Barely Mobile and Immobile weight stages for each party member
- An entirely new 5th party member, complete with wholly unique weight stages, images, skills, and weight descriptions
- New mechanics involving party building and pairing up the members of the group
- Tons of new dialogue involving the 5th party member
- A new character skin for Estelle that entirely reworks her weight stages
- A new character skin for Astrid that entirely reworks her weight stages
Once again, here are the links: (https://www.patreon.com/jupitarian https://subscribestar.adult/jupitarian). I appreciate any and all contributions! If you don't want to join my Patreon, though, I understand. I would ask that you at least consider the "join for free" option that Patreon offers so that you can keep up with the game's updates. There's even a bonus feature that free members can receive, but you'll figure out what that is if you play enough!
And that's about it! Feel free to leave a reply or visit the FATACLYSM project page on Weight Gaming if you have any questions, bug reports, feedback, or what have you. You can also join the FATACLYSM Discord if you'd like to stay connected with the game and community.
(https://discord.gg/beXS59B8Ds)
Enjoy!
7/11/25 v0.2 - The Leona Update!
The newest content update is here at last! This version contains changes for both the public and supporter builds of the game.
New content added to the free version
- The Palace is now accessible!!! Have fun discovering all the secrets of the second layer!
New content exclusive to Patreon supporters
- An entirely new 5th party member has been added, complete with her own unique set of weight stages, images, skills, and weight descriptions!
- New mechanics involving party building and the ability to assign members of the group into duos
- Tons of new dialogue involving the new party member, with nearly every event and ending having been rewritten or added to in some way
- New event choices unlocked after recruiting the new party member
- A new multi-part sequence involving a couple of characters, made by the one and only bun! It can be found in one of the new event choices in the Penitentiary.
IMPORTANT - HOW TO TRANSFER SAVES BETWEEN VERSIONS:
1. Go on your old version of the game and make your way to the Cathedral
2. Open the Saves menu and click the "Save to Disk" option, and then save the file somewhere you'll remember (like your Desktop)
3. Launch the new build of FATACLYSM
4. Open the Saves menu, click "Load from Disk", and then double click your save file, wherever you put it.
5. And everything should work! Let me know if you have any issues with this process.
| Status | In development |
| Rating | Rated 4.3 out of 5 stars (138 total ratings) |
| Author | Jupitarian |
| Tags | Adult, Erotic, Fantasy, Roguelike, Roguelite, Sci-fi, Singleplayer, Text based, Twine, weight-gain |
Download
Install instructions
Step 1 - Download the FATACLYSM zip file.
Step 2 - Unzip the file using whatever program you have available to you (WinRAR, 7Zip, etc.)
Step 3 - Go into the new folder and double click on the HTML file, and the game will be launched in your browser. It's that simple!
Development log
- FATACLYSM 0.2, The Leona Update, is OUT NOW!!!Jul 11, 2025
- FATACLYSM 0.2 Release Date - Friday, July 11th!Jul 09, 2025
- FATACLYSM v0.1.3 - A Little Bit of EverythingNov 01, 2024
- New Game - WASTELINEAug 30, 2024
- FATACLYSM On Other PlatformsAug 15, 2024
- FATACLYSM v0.1.2 is out!Jul 28, 2024
- LAYER 3 POLL ON PATREONJun 16, 2024
- v0.1.1 Update Released!Jun 09, 2024






Comments
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I want to be able to download this properly to my phone to play it, is there gonna be an android-specific version made at any point? (Cuz running it in my browser is a bit of a pain)
Probably not.
I'd love if the next update contains slime girls like the one in grandmaster of Gluttony or just similar slime things
Is there a way to remove the AI content?
Is there a way to extract the file on phone and have the images working? I can't get past the tutorial due to lack of image indication.
Isnt this AI?
will the patreon version come to the free version in the future update?
btw Love this game and looking forward to new content (even though im using the free version now)
For some reason, I'm missing a single Misc. Character in my gallery, even though my profile says I've done all the events. I think it's supposed to be that one Enforcer that's being attacked by the machine, but no matter how many times I re-encounter her, she never shows up in my gallery.
Have you seen every dialogue?
From what I can tell, yes. I even did a couple of runs to double-check I had seen each party member's text for escaping and for becoming immobile. Still nothing.
I have a question cus like i wanna play this game on android dose it work on emulator?
I'm noticing something weird with the Duo Skill - is it supposed to be free once per combat, or once per run? Leona/Astrid pair in case it's character specific, but I find it uses Astrid's energy up even if use of the skill is spread across multiple battles and layers.
Yo idk why its happening but i am not able to add or go duo with leona in my party. Like when i go into the pallace leona is included in the combat but i cant see her images cuz of my other 4 party members. Her name is not there in the swap/change party members option that you get before going in for a raid.
Every time I try to run the file on my joiplay (the latest version of patreon), it exits and the message saying "out of memory error" appears, how do I fix this? (Note: don't say anything about running in the browser, because as I play on my cell phone, I don't have a PC, in addition to the icons and images of the characters during the dialogue not loading correctly, when I try to use the characters' actions it's a headache .)
Idk but the new stages, "barely mobile" dont show and its just a error mesage.
Also, i like the new update ^w^ its amazing
Glad you're enjoying it.
Also, thanks for reporting that bug, it should now be fixed in the current version.
When will the paid version be released to the public?
Discord link isn't working. Is the server gone?
The server is still alive and well. The link itself seems to be functional for me, so I'm not sure why it wouldn't work for you.
I have a problem with the sound in my phone game, which I even extracted as needed.
A pretty cool DarkestDungeon-like game. Since HTML is not that different from open source, would you allow others to localize it?
Apart from the wonderful story content, the playability and balance of the game are already quite professional, except that the code is too repetitive (not important at all)
Yeah, I'm not really the best at coding Javascript, so there's alot of silliness in there. If you're interested in potentially doing some localization, feel free to join the Discord and send me a message.
is this still being worked on ?
Yes. Development updates are posted on Patreon about once or twice a month.
4
ohh shit i never thought about that
Any updates? No rush...
Great potential though the game could do with a smoother learning curve. One fight in and the game's throwing a dozen mechanics at you all at once.
The images dont seem to load at all how can i fix that?
how you can play this in iPad?
Try and download RAR on it
Maybe is too much for ask here, but will be more transformations in the future involving other fetishes?
Is it possible to play this on mobile
Yes but its awkward at best, but on an ipad its even better.
How do you play it on mobile?
It actually a lot more simple than it looks and you need RAR to extract most files. You can find that on the play store and it looks like a bunch of books.
So like. How do i play it?
If I remember correctly you have to extract the file, Click on the HTML and hit whatever browser you mainly use. It didn't work as well for me on internet but it worked better on chrome. But if it works better like that for you then that is ace. Also there is a chance that images might not work but that is slim.
echoing what i said already in the comments... I still think astrid should be green... fr...
:thehorror:
can you choose player gender?
No, the protagonist and party members are all female.
Hi im having an issue where there is no audio. i checked the in game settings and everything looked fine, am i missing something or is this a browser issue? (Really fun game btw)
Did you extract the file?
Beat the demo and it is unironically probably the best weight gain game out there
When might The Palace be released to the public, or is it not finished yet?
Is this playable on mobile?
I'm really curious about replacement party members. I hope they are coming soon!
I think you should make astrid green or something.
Is there perhaps aother way to get the full game? I don't have a credit card so i cannot support you on Patreon.. And PalPal is demanding i add a credit card as well so i still have the same issue
А андроид будет
Hi, I'm really enjoying the game and look forward to the next update. I have some feedback that would improve the experience in my opinion.
I think more sound effects (especially fattening and stomach sound effects) would improve the experience. I think that the Sovereign boss is a bit too easy to defeat, bull-rushing her exclusively seems to work every time, and it's bit too easy to pull off. I think that there should be more weight stages for the playable characters (I'm aware that there is 8 already, maybe 10 or 11?).
That's all, I really enjoy the game and I will continue to support your patreon in the future. Good luck and well done!
Excellent Game thanks for the updates difficulty was a bit hard on main floor bosses mini floor bosses weren't as much a problem though!