In commemoration of the 20th anniversary of the classic shooter game Quake, MachineGames has announced a brand-new ‘free’ episode for the game.

MachineGames is the developer of Wolfenstein: The New Order and Wolfenstein: The Old Blood. Though MachineGames was actually not related to the original version of Quake -- launched in 1996 -- in any way, it has released the new free Quake episode in celebration of the game’s 20th anniversary.

The new Quake episode launched by MachineGames is called ‘Dopa.’ Announcing the new episode for Quake, MachineGames said that the episode is now available as an absolutely free download "as a gift to the fans" of Quake.

However, to run MachineGames free new Quake episode, gamers will require their own copy of the game.

To get MachineGames’ new ‘Dopa’ episode for Quake up and running, gamers can obtain a copy of Quake from Steam; or import an already owned copy of the game to their Steam library. They have to then download ‘Dopa;’ extract it into the Quake folder; right-click on Quake in their Steam library; and choose the ‘properties’ option. Thereafter, they have to click on ‘Set launch options;’ type "-game dopa" into the prompt; and run the game on Steam.