<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.

if [ -z "$1" ];then exec echo "Please give me something to check.";fi;bash -c "if [[ $1 ]];then echo 'True.';else echo 'False.';fi"