"What would a game like this be?
It would be thought provoking.
It would be revelatory.
It might contribute to the betterment of society.
It would force us to reexamine assumptions.
It would give us different experiences each time we tried it.
It would allow each of us to approach it in our own ways.
It would forgive misinterpretation - in fact, it might even encourage it.
It would not dictate.
It would immerse, and change a worldview."
— Raph Koster, A Theory of Fun For Game Design (info)