Undertale: Merge Universe by Losas Guy (Developer) and team

Undertale Orange by team -Undertale_Orange-

UNDERTALE Tribulations by team UndertaleTribulations

DeltaFateTale by team Deltafatetale

Undertale RUIN by Killergourder Studios (SamChanda)

HORRORWORLD by Queen_of_this_world

Undertale: Abandoned Cyan by Team Abandoned Cyan

FALLENBOT [Undertale Mod] by Chroma Team Official

Deltaswap: Soul Song [PAUSED] by Sad Simps Teto

Undertale Lavender by TeamLavender

CS!Storyshift by ShiftChara13

STARRUNE by Ikaryu (revived)

Undertale Purple by EyeDaleHim

MUSESTRUCK by BrennanGames (not a UT/DR game, but inspired by them)

FlappyTale Ultimate by Team Road Trip

SK!DarkTale by just_spink

UNDERTALE : Fighting Spirit by Harry_U_FS

UNDERTALE : Determination by Wendee

DELTARUNE - Hypothesis by uprank and team

UNDERTALE NEXUS by PixelRoyal

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= Statistics on project statuses =

~ active projects: 369

~ cancelled projects: 21

new - Undertale: Wonders of Patience [CANCELLED] by Team Wonders

new - DAG!UNDERFELL by team DAGUNDERFELL

new - AMA!Underfell by team AMA!UNDERFELL

new - [CANCELED] Undertale: Tales Of Kindness [Comic Series] by SakuraWinterz

~ completed projects: 5

~ projects with undefined status: 3

~ projects that refused support: 0

~ projects that revealed the demo date: 6

= Statistics on genres and alternative universes =

Total active Undertale projects: 332, including

~ Underswap AUs: 29

~ Underfell AUs: 15

~ Storyshift AUs: 8

~ Dusttale AUs: 26

~ Prequels: 136

~ Sequels: 20

~ Crossovers: 7

~ Other UT AUs: 85

~ UT mods: 6

Total active Deltarune projects: 37, including

~ New chapters: 11

~ Other DR AUs: 25

~ DR mods: 1

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Also check out MangleNightmare's list - there are a lot of cool projects!

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~ You can see all my activity here