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Not a Very Good Secret achievement in DOOM (1993)
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DOOM - DOOM Mission 1 The UAC - Collectibles, Secrets, Locations Guide - GameThroughs
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/cdn.vox-cdn.com/uploads/chorus_asset/file/12766453/Screen_Shot_2018_08_31_at_6.28.38_PM.png "Doom 2's impossible secret is discovered, 24 years later - Polygon")
Doom 2's impossible secret is discovered, 24 years later - Polygon
Doom secrets, collectibles guide: Where to find all hidden secrets, plus Doom Switch differences explained | Eurogamer.net
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Official secret areas in PC Doom/Ultimate Doom
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Amazon.com: Doom - Xbox One : Bethesda Softworks Inc: Everything Else
