(666) UTMM: Undertale Slop Mania

A Roblox experience owned by Thought Machine.

RacingENUndertaleRPGBoss Fight

Description (written by the developer; not a statement by this register)

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!

Last updated by the developer 11 Aug 2026, 00:52 UTC.

playing (measured 11 Aug 2026, 04:38 UTC)

478,799

lifetime visits

89%

liked (3,125 👍 / 392 👎)

4,790

favourites (10.0 per 1k visits)

27 June 2025

created (per Roblox)

Play on Roblox →

Live players over time

Growth

Growth history is still building. We hold one measurement for this entry. A trend needs at least two, taken days apart — so this will fill in on its own rather than being estimated. We do not publish numbers we have not measured.

Measurement log — every players count we have recorded
Measured (UTC)	Players	Change
11 Aug 2026, 04:38	24	first reading

Concurrent players at each of our measurements (insert-on-change).

Monetization — game passes

PAY COLLEGE FOR REV

100,000 R$

GIVE MONEY TO DEVS HAHAHHAA

10,000 R$

Unlimited Reforges & Geming

1,250 R$

Unob pickaxe

845 R$

Infinite Unob and Holy Stone

650 R$

The "P2W" Kit

400 R$

Vip

365 R$

Starter Kit

190 R$

the rod...

99 R$

OP WEAPON

59 R$

Donation

50 R$

Game passes for sale and their prices, measured from the Roblox passes API. Developer products bought inside the game aren’t publicly listable.

Badge funnel

I. COMPLETED TUTORIAL · welcome71,684 · 39.4% win

II. FREEDOM · progression7,600 · 6.6% win

Solo M87 · other1,011 · 2.8% win

Solo Young Folk · other573 · 0.90% win

How many players have ever earned each badge — a proxy for how far players get before they stop. Steep drop-offs mark where a game loses people. Win rate is the past-day share of players who earned it; categories are assigned by a language model from each badge’s own name and description.

Roblox recommends these alongside it

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Undertale Tower Defenseby Tower Of Generations

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Roblox’s own “games like this” rail, as we recorded it on 22 August 2026. The order is Roblox’s, not ours. Which games it points at most →

Like ratio over time

Growth

2 measurements spanning 10 days. Dots are measurements; the straight line between them is drawn to join them, not to claim we know the path taken in between — snapshots are recorded only when a count changes, so gaps mean “no change observed”, never “interpolated”. The vertical axis spans 88–90 and does not start at zero.

Measurement log — every % liked count we have recorded
Measured (UTC)	% liked	Change
24 Aug 2026, 21:38	89	no change
14 Aug 2026, 21:36	89	first reading

Percentage of votes that are likes, at each of our measurements. A falling line is a game losing its crowd’s goodwill.