This week, classic PC shooter Doom turned 21. So if you see someone in green slide up next to you at a bar and scream RIP AND TEAR, buy the guy a drink.
To celebrate, John Romero, one of the key figures involved in the creation of the game, shared a ton of artwork from Doom's development. You can check it out below. The collection includes everything from pencil-drawn sketches to animation tests. Most of it is pretty rough, but then, so was 1993.
You can read more about how Doom was made in this interview Stephen did with Romero and John Carmack last year. And if you want to read more, and haven't read Masters of Doom yet, get on it.
Oh, and note that these images came from a dump that Romero put up for download yesterday; if you want to see some commentary for them, scroll down his Twitter feed.