<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.

'ASCII digit to integer conversion (positive values only)
'Programmed by Jeffry Johnston, 2005
1[1?,1~10:2,0+*0,2=*0,0+*0,0+*0,0+*2,0+*1,0-48]1
2[0#]0