<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.

'Random number generator with period 2^64
'Programmed by Jannis Harder (jix), 2005
1[0^]2
2[1=*0,0>1,1|1,1|*1,1<1:3,1#]2
3[3=9223372036854781733,2=*3,2|*0,0|*2,2|*3,0|*2,1#]2