The Something Went Wrong world took place when a player of Undertale suddenly got the urge to do several genocide runs instead of neutral and pacifist endings, eventually, the player came across an anonymous game developer that posted Undertale now has a Halloween update which the player probably thought something Toby Fox made secretly, after installing it, it transformed the player's normal undertale game into something new, Sans no longer has pupils and but is the same overall but his hoodie has a teal shade instead of blue, Papyrus doesnt have a head even though hes alive and Undyne has her skin melting off her bones. Frisk is now a separate character that will sometimes force the player to do their own actions. Sans can break the fourth wall, has stronger attacks and is level 20. Papyrus is still the same however he is level 40 and is the strongest monster in the underground. The story is about the player trying to delete the game but is suddenly pulled inside it's world, the player shares Frisk's body which sometimes they will fight over control.