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Undertale AU Games

Discover Undertale AU games and alternate-universe boss battles. Browse fan-made fights featuring different characters, stories, and battle variations.

Undertale Last Breath
Disbelief Papyrus Fight Simulator
Omega Sans Fight
Undertale vs Gojo Fight Simulator
Dust Sans Simulator
Murder Time Trio Fight Simulator
Dusttrust Finality Boss Fight Simulator
StoryShift Chara Fight
DustBelief Papyrus Phase 3 Fight Simulator
Horrortale Sans Fight Simulator
Last Breath Renewed Phase 2 Fight Simulator
Bad Monday Simulator
Bad Time Trio Simulator
Nightmare Sans Fight Simulator
TS!Underswap Papyrus Fight Simulator
Dustbelief Papyrus Multiplayer Simulator
Geno Sans Simulator
Genocide Papyrus Fight Simulator
JoJo Sans Fight Simulator
OMNILOVANIA Boss Fight Simulator (v1.2)
Swapfell Sans Fight Simulator
VHS Sans Fight Simulator
FellSwap Sans Battle Simulator
King Multiverse Sans Fight Simulator