) is a very fun pen and paper game to play with friends. I've done it with friends to kill time on long bus trips a few years back: you write down a pad of paper a couple of basic rules of the game, including a few rules on how to add and vote for rules, and you keep playing in turn until the rules change enough for someone to be declared the winner or that the game becomes unplayable.
Ethereum would be a great platform for an online version of Nomic, with real stake. First you use some way to know that all players are different people (no sock puppets) and then everyone puts down some amount of money that can't be moved by the initial contract. Then the players vote on changes to the contract until someone is able to withdraw the money. Since some money will always be spent playing, if the money is distributed equally, everyone will have lost money.
Has anyone ever played Nomic?