E1M1/HANGAR: No keys


E1M2/NUCLEAR PLANT: Keys


E1M3/TOXIN REFINERY: Keys


E1M4/COMMAND CONTROL: Keys


E1M5/PHOBOS LAB: Keys


E1M6/CENTRAL PROCESSING: Keys


E1M7/COMPUTER STATION: Keys


E1M8/PHOBOS ANOMALY: No keys


E1M9/MILITARY BASE: Keys


E2M1/DEIMOS ANOMALY: Keys


E2M2/CONTAINMENT AREA: Keys


E2M3/REFINERY: Keys


E2M4/DEIMOS LAB: Keys


E2M5/COMMAND CENTER: No keys


E2M6/HALLS OF THE DAMNED: Keys


E2M7/SPAWNING VATS: Keys


E2M8/TOWER OF BABEL: No keys


E2M9/FORTRESS OF MYSTERY: Keys


E3M1/HELL KEEP: No keys


E3M2/SLOUGH OF DESPAIR: Keys


E3M3/PANDEMONIUM: Keys


E3M4/HOUSE OF PAIN: Keys


E3M5/UNHOLY CATHEDRAL: Keys


E3M6/MT. EREBUS: Keys (blue key position depends on Skill level)


E3M7/GATE TO LIMBO (LIMBO): Keys


E3M8/DIS: No keys


E3M9/WARRENS: Keys


E4M1/HELL BENEATH: Keys


E4M2/PERFECT HATRED: Keys


E4M3/SEVER THE WICKED: Keys


E4M4/UNRULY EVIL: Keys


E4M5/THEY WILL REPENT: Keys


E4M6/AGAINST THEE WICKEDLY: Keys


E4M7/AND HELL FOLLOWED: Keys


E4M8/UNTO THE CRUEL: Keys


E4M9/FEAR: Keys