Given a starting topic and a finishing topic, you have to find a path of clicks through Wikipedia that lead from the first topic to the second topic. Speed is how you are ranked.
Start with "On the farm", and connect ideas in a mind map. As you reach the edge of the screen, your mind map expands into other areas. If you start playing and would like to combine maps with what I have, post the URL given after you click the "Save Game" button.