MachineGames, the developers behind Wolfenstein: The New Order, have created a new episode for the original Quake to celebrate the game's 20th anniversary. This episode will be about as long as an episode in the original game, with eight individual levels and a unique setting and story.
If you already own Quake on your PC, you can download the level as a .RAR file here. To install the new episode, all you have to do is extract a folder named "dopa" from the .RAR file, and add it to Quake's main directory in your computer's files. From there, open a file called "dopa.exe" within the folder, and the level will install itself, after which you can play it by starting a new single player game in Quake.
Follow after the jump for more information!