Here’sanother explanation of the games rules (or lack thereof).
Also, a slide-deck from the creator of the game on Philosophy of Creativity: Finite and Infinite Games.
Remember Calvinball, from Calvin and Hobbes, where the game could never be played the same way twice? That’s the idea here… creative, fun anarchy.
(2014 update: I never managed to get a game together. I still would like to. Also: the Wikipedia page on the game.)