<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.

We would have an explanation of abstract nonsense here, but it fled into a diagram and we haven't been able to chase it. We will try again once we find an abstract machete.