Ever been thumbing thru your copy of Euclid’s Elements and thought to yourself that “gee golly, this is super entertaining, but I sure wish it was more like a computer game?” Can’t help you with your internal monologue speech impediment, but now you have the answer to the eternal question “what is basic geometry good for?” – it will serve as a walk-thru of this: (thanks to Bogdan for the link!) http://euclidthegame.com/