E1M1, HANGAR: No keys
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E1M2, NUCLEAR PLANT: 1 key
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E1M3, TOXIN REFINERY: 2 keys
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E1M4, COMMAND CONTROL: 2 keys
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E1M5, PHOBOS LAB: 2 keys
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E1M6, CENTRAL PROCESSING: 3 keys
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E1M7, COMPUTER STATION: 3 keys
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E1M8, PHOBOS ANOMALY: No keys
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E1M9, MILITARY BASE: 3 keys
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E2M1, DEIMOS ANOMALY: 2 keys
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E2M2, CONTAINMENT AREA: 3 keys
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E2M3, REFINERY: 1 key
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E2M4, DEIMOS LAB: 2 keys
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E2M5, COMMAND CENTER: No keys
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E2M6, HALLS OF THE DAMNED: 3 keys
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E2M7, SPAWNING VATS: 3 keys
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E2M8, TOWER OF BABEL: No keys
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E2M9, FORTRESS OF MYSTERY: 3 keys
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E3M1, HELL KEEP: No keys
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E3M2, SLOUGH OF DESPAIR: 1 key
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E3M3, PANDEMONIUM: 1 key
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E3M4, HOUSE OF PAIN: 3 keys
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E3M5, UNHOLY CATHEDRAL: 2 keys
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E3M6, MT. EREBUS: 1 key (blue key position depends on Skill level)
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E3M7, GATE TO LIMBO (LIMBO): 3 keys
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E3M8, DIS: No keys
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E3M9, WARRENS: 2 keys
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E4M1, HELL BENEATH: 2 keys
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E4M2, PERFECT HATRED: 2 keys
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E4M3, SEVER THE WICKED: 2 keys
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E4M4, UNRULY EVIL: 1 key
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E4M5, THEY WILL REPENT: 3 keys
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E4M6, AGAINST THEE WICKEDLY: 3 keys
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E4M7, AND HELL FOLLOWED: 3 keys
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E4M8, UNTO THE CRUEL: 2 keys
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E4M9, FEAR: 1 key
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