Nomic is a game in which play consists of making changes to the rules. It was created in 1982 by philosopher Peter Suber and first introduced to the public in Douglas Hofstadter's "Metamagical Themas" column in the June 1982 edition of Scientific American.
In his column "About Nomic: a heroic game that explores the reflexivity of the law," Hofstadter presented excerpts from Suber's then-unpublished book The Paradox of Self-Amendment, which explored how legal "rules of change" (such as constitutional amendment clauses) may apply to themselves and authorize their own amendment. The game of Nomic explored these questions about self-reference and the nature of law.
The game begins with a simple initial ruleset that primarily regulates the rule-changing process itself, along with one deliberately mundane rule about scoring points. Players are expected to quickly amend the rules through democratic voting to create the game they want to play.
For more information, see Peter Suber's original Nomic ruleset.