John Romero Plays Doom and Explains Its First Episode
IGN · Interview · 1 h 31 min · 2013 · YouTube title: We Play Doom With John Romero
Why it's here
HN commenters point to it as a fantastic developer commentary on how Doom's first episode was made.
What it covers
IGN plays through the first episode of the original Doom with its creator John Romero providing commentary. Romero shares stories, design secrets and behind-the-scenes details about the levels, including E1M1.