*Quote from the creator*
Nomic is a game in which changing the rules is a move. In that respect it differs from almost every other game. The primary activity of Nomic is proposing changes in the rules, debating the wisdom of changing them in that way, voting on the changes, deciding what can and cannot be done afterwards, and doing it. Even this core of the game, of course, can be changed.
Because the rules are always changing, there is no absolute set of rules to Nomic. There is only the starting or initial set of rules. There are 29 numbered rules in the Initial Set. Most are "procedural" and govern the process of changing the rules or the facts of life in a game where the rules are always changing. The chief exception is Initial Rule 202, which should be read first. Rule 202 is practically the only "substantive" rule in the Initial Set. It tells how to earn points to win. The mechanism is as simple as possible: one throws a die or makes a calculation. The substantive portion of the game is deliberately simple so that the players can decide, through rule-changes, what kind of game they want to play. If they make no decision here, they will be fully occupied in what I call a "procedural" game, which many players choose deliberately. In a substantive game, players aim to score points and win. In a procedural game, players try to tie the rules into the most interesting knots imaginable and to win not by points (Rule 208) but by paradox (Rule 213).
For more information: http://www.earlham.edu/~peters/writing/nomic.htm
I'm currently running a nomic at http://nomicia.forum-motion.net/forum.htm and looking for some new players, head on over if you're interested at all.