I am working on a game of sorts using nothing but Wikipedia. It is a very simple game, where a city must maintain a strong enough force to repel barbarians. It is in fact a very simple game, however since I cannot store any variables, I have to rely on Wikipedia's variables such as the current day and current month. This makes it quite a challenge, since I then have write the same code lots of times.
It's currently incomplete, the basic idea is there, however I intend to create functionality such as a monthly breakdown of the losses and gains from the city.
You can alter the outcome of the "game" by creating an article on the Wiki. One article represents two gold. This gold is used to train more swordsmen.
You can find it on my profile page: http://physxinfo.com/wiki/User:AquaGeneral