Trivia

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Did you know that Doom's intermission screen shows the Tower of Babel being built during the second episode?

Did you know that the level names in Thy Flesh Consumed, the final episode in Ultimate Doom, are all taken from passages in the Bible?

Did you know that the soul sphere was originally supposed to be an "extra life" powerup, before the concept of lives was dropped during development?

Did you know that the chainsaw and shotgun weapons in the game were inspired by the Evil Dead series of movies?

Did you know that a super shotgun blast at close range can do more damage than the rocket launcher?

Did you know that the nearby presence of demons and zombies is indicated to the player by a sound?

Did you know that Doom 3 contains numerous references to classic Doom?

Did you know that Doom contains an extra status bar face which is hardly ever displayed due to a bug in the game?

Did you know that Doom's automap was originally intended to include a minigame as an easter egg?

Did you know that the Nightmare! skill level was added as a joke, in response to comments that the game was too easy?

Did you know that Doom Alpha version 0.5 had an old version of MAP10: Refueling Base from Doom II in it?

More trivia
Did you know that Doom was originally supposed to be based on the movie Aliens?

Did you know that the name "Doom" comes from a scene in the movie The Color of Money?

Did you know that, in Doom versions up to 1.1, it was possible to run the game on three monitors at once, giving a 270-degree field of vision?

Did you know that the -avg command line parameter refers to Austin Virtual Gaming, a shop near the University of Texas set up in 1994 for pay-for-play Doom deathmatches?

Did you know that the -turbo command line parameter was added to Doom by John Carmack in a setup that would allow Shawn Green to beat John Romero in a deathmatch?

Did you know that the abbreviation BFG stands for "Big Fucking Gun"?