This is a style of play, a methodology, for any RPG.

It is an experiment, an exercise, in which the Game Master does no prep. Everything must be prepared by the players. The process I recommend is contained within. It favors a minimal approach.

Reasons to be a Player.
Engage personally in the process of shaping the world! Get perspective on the process of the Game Master. Collaborate with your fellow players.

Reasons to be the Game Master.
Relinquish some control. Trust your players to make something interesting. Or funny. Build off their work and expand the world.

References to MARP, the TTRPG system I created, are used as examples. You can find that game here: https://salubriousbrew.itch.io/marp