[dr_monster]

This is a plot point in the Orson Scott Card novel 'Ender's Game'. Ender plays a generative video game on an iPad-like device that responds to his decisions and incorporates people/events from his personal life, to the point of manipulating his subconscious thoughts and dreams.

A game like this could be interesting, but you would not be able to discuss it with others as a shared experience that has fixity the way you can with any modern media, and it could certainly be used to manipulate people.