Make and run your own country…. NationStates.net allows you to create your own country, decide how it starts out by answering a short questionary, and then it gives you issues to solve (one per day, though you can set it to two per day). How you answer those issues determines how your country fares, the type of country it is, and many other things.
You can join the UN and elect a regional representative, create your own region that you and your friends can migrate to (all new nations start out in The Pacific, which is consequentially the largest region in NationStates, but you can move wherever you want). [MetaFilter]
This is another interesting learning game, much like the world game by buckminster fuller.