Mythic Role Playing
An universal improvisational game¸ which has rules for spontaneously generating adventures. It uses parameters determined at the start¸ combined with randomly determined answers to yes/no questions. It is designed to be playable as a standalone RPG or also as a supplement for GM-less play using other RPG rules. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim