<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.

Ravnica: City of Guilds is a city of guilds. “City of Guilds” is part of its name. The Wizards of the Coast Marketing Department: We Sell Anything thought players might not notice it was a City of Guilds unless they put the tagline into the name.