Q1K3 - a 13 kilobyte playable Quake clone
Cruising around the internet can uncover some weird , wonderful and obscure things. Luckily for us, one of those things is a "clone" of Quake in the form of a 13KB JavaScript game, playable right in your web browser called Q1K3.
Written and published by Dominic Szablewski, it was created as an entry into a competition called Js13kGames. It contains only 2 levels similar to the first 2 levels of Quake, but it's a technical marvel nonetheless.