Play a new episode for old Quake from the Wolfenstein: The New Order studio

MachineGames has released a new episode for the original Quake to celebrate the 20th anniversary of Id Software’s wildly influential first-person shooter. You can download the chapter for free here; you’ll need to extract the package into your Quake folder, then set "-game dopa" as a launch option in Steam. Quake is $2.49 in the Steam summer sale right now, in case you don't own it.
Quake came out on Saturday June 22nd, 1996 — just one day before Super Mario 64,