<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.

Eöl was called the Dark Elf; he was a great smith who dwelt in Nan Elmoth, and took Aredhel Turgon’s sister to wife; friend of the Dwarves; maker of the sword Anglachel (Gurthang); father of Maeglin; put to death in Gondolin.