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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
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Doom Guide: Secret & UAC MarineGuy Locations Guide - GamersHeroes
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Not a Very Good Secret achievement in DOOM (1993)
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