There is no single "official" game; instead, several talented developers have created different "takes" on this AU. The most reliable places to find these downloads are Game Jolt and itch.io. Dustbelief Papyrus | New Undertale Fanon AU Wiki | Fandom

is one of the most intense and emotionally charged fan-made expansions of the Undertale universe. Born from a fusion of the Dusttale and Disbelief alternate universes (AUs), this character and the resulting fangames provide a grim "what if" scenario that flips the script on one of gaming's most lovable characters. What is Dustbelief Papyrus?

The "Dustbelief" timeline begins when Sans, driven to madness by countless Genocide runs, attempts to kill Papyrus to gain enough to stop the human. In a tragic twist, Papyrus kills Sans in self-defense. Traumatized and fueled by a hallucination of his brother's "phantom," Papyrus adopts Sans’s mission, slaughtering other monsters to become powerful enough to finally end the human's cycle of resets. Where to Download Dustbelief Papyrus Games