VenDust: The commotion by The Just Dan and team

Undertale Purple by Samuelpoukkyy [AI, but still... ]

UNDERTALE GREEN by Arctic452910

Undertale Orange + Green by ElbyIzDum and team

DELTARUNE EVERLASTING by Pancakeeee

Project Bluelight by hadulm and team

Undertale Orange by Proto-Y

DELTARUNE [[1997]] by Aidan157

Undertale : [ALL-ALONE] by BoneMaster3653

ULTRATALE by scoops1 and team

Undertale Cyan by Veilthevalor

Deltarune: Frozen Memories by NixCat

Undertem by keepChattingANE

Undertale : Tales of the War by NoxaTry

Undertale: Outlaws by Skorlup Games

= Statistics on project statuses =

~ active projects: 501 (+15)

~ completed projects: 9

~ cancelled projects: 59 (+1)

new - Deltarune:Patchwork by Modnii1ovec

~ projects with undefined status: 119 (+5)

= Statistics on genres and alternative universes =

Total active Undertale projects: 442 (+13), including

~ Underswap AUs: 28

~ Underfell AUs: 14

~ Storyshift AUs: 11

~ Dusttale AUs: 29

~ Prequels: 194 (+8)

~ Sequels: 31

~ Crossovers: 12

~ Other UT AUs: 107 (+5)

~ UT mods: 16

Total active Deltarune projects: 59 (+2), including

~ New chapters: 18

~ Other DR AUs: 38 (+2)

~ DR mods: 3

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When making the list, I rely on personal perception. If you think that any project has been overlooked, or you want to clarify if there is a particular game on the list, you can always ask me about it.

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~ You can see all my activity here