Board Thread:Questions and Answers/@comment-26072045-20160525162201/@comment-26887879-20160525172628

Well, when you finish True Pacifist, exit to Surface, go trough credits and Flowey gives you that message, you get options to "Continue" (just walk around trough completed areas) or "True Reset". When you get to that, the menu music is creepy and slowed down, simmilar to Genocide route... I think that while Frisk is gone, Chara's essence is left underground and through them, player can Continue/True Reset. Much like Flowey, they are awoken by large amount of Determination wich probably allows them to take control, even during True Pacifist...