Play DOOM, Heretic and Hexen in the Unofficial Homestuck Collection.
Make sure to install it by grabbing a copy from the Releases on this repo. If you wish to clone the repo instead, make sure the mod files are in a folder titled 'tuhc-doom' in the mods folder, as having the name be anything else will break it.
DOOM created by ID Software Heretic and Hexen created by Raven Software Ported to Flash by Mike using Adobe Alchemy