Undertale: Remembering the GENOCIDES is an Undertale (joke) fangame (and yet another generic sans fangame) that took place of 69,000 genocide routes. Sans remembers you're genocides and decided to stop you early at Snowdin. Fight him to WIN.
After 69,000 Genocide routes, Sans has finally lost it. He had enough. The only way to stop this is to REMEMBER THE GENOCIDES. Papyrus was aware of it too, he decided to find someone he could help. He found a door and met someone he was familiar with, because he missed his father so mach... Then they teamed up to stop SANS of his puns. Their fate will choose as you decide.