<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.

#!/usr/bin/perl
sub k{my$t;$t=~y/IVXLCDM/XLCDMEE/,$t.=("",I,II,III,IV,V,VI,VII,VIII,IX)[$_]for/./g;$t=~s/.*E.*/Number too large/;$t}$_=(shift=~/(\w+)/)[0];print k,$/