WikiWarp - the Wikipedia Game

Neat idea. Perhaps you could implement it as a bookmarklet which injects a game-managing script into real Wikipedia pages, so that the article-viewing traffic is still served from Wikipedia. (I mention this because your site is glacially slow right now.)

See the 'Wikipedia History Contest' winners for ideas:

http://waxy.org/2005/06/wikipedia_histo/

(They used Greasemonkey but a bookmarklet could achieve something similar. Or, the MediaWiki 'user.js' functionality, where a user can set their own custom JS to be included in pages.)