There are games based on Wikipedia:
- Wikipedian Tag, where two people start on different pages, and move by following links
- Get to Philosophy, where you move through pages by selecting the first link on each page and end up at Philosophy or in a loop. I got to Philosophy from both of the random pages I tried: Jujols and Layanese.
-Wikipedia Maze which is a version of Six Degrees of Wikipedia.
-Wikirace, where you compete to travel from one article to another in the shortest number of steps.
All of those are based on the links, but work is underway for a Trading Card Game based on Wikipedia as well.