Legendary game-developers John Romero and Tom Hall perform a post-mortem on DOOM (1993) at GDC 2011. They talk about the development of this classic FPS and you get to see a lot of pre-alpha and beta footage from the game.
This is the whole post-mortem in one video, so sit back and get out the popcorn!

Original source: http://www.gdcvault.com/play/1014627/...

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