<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.

#!/bin/sh
id=$1
expr "$1" + 0 >/dev/null 2>&1 || exit 1
head -n $((id-1)) quotes >quotes.new
tail -n +$((id+1)) quotes >>quotes.new
diff quotes quotes.new >/dev/null && exit 1
printf "*poof*%s" "$(quote $id | cut -d')' -f2-)
mv quotes.new quotes