How about a game similar to Minecraft where you are on an island or a newly discovered planet and your objective is to build a government free society. You would have certain objectives like building a transportation system and different services to meet the community's needs. In the game the users would vote on each persons rules and attemps to meet the objectives based on the democratically selected rules. It would be a model then for a real government-free community to be built at some future time in the real world.