by Thought Machine
UTMM: Undertale Slop Mania Codes
Working UTMM: Undertale Slop Mania Codes
Last updated August 21, 2026
No working codes right now
We're tracking UTMM: Undertale Slop Mania and will list codes here the moment the developers release them. If you spot one first, send it our way below.
How to redeem codes in UTMM: Undertale Slop Mania
- Launch UTMM: Undertale Slop Mania on Roblox.
- Look for a Codes, Shop or settings button — usually on the side of the screen.
- Paste the code exactly as shown above. Codes are case-sensitive.
- Press redeem to claim your reward.
Codes expire without warning — if one fails, it was almost certainly pulled by the developer.
Found a code we're missing?
Submit it and we'll verify it before it goes live.
About UTMM: Undertale Slop Mania
Undertale Slop Mania is an Undertale RPG where you can craft items and fight bosses. Currently over 100+ enemies and 13+ resets with content on every one. Contains references to CRAFTWARS or straight up bosses from it Thanks to Nikolander and Doggo for the original kit. This game uses it with some changes made to it, tries to keep the game in its original state lol. This game isn’t meant to be taken seriously. Mostly your average UTMM ( UNDERTALE MONSTER MANIA ) game. Most of the assets were made by hedrrisuo and AzureOrbit Some of the songs come from: Lisa ( The Franchise. Painful, Joyful, Etc. ) Dream Emulator Undertale, Deltarune (fanmade and official) Yume Nikki etc. Thanks for playing!