01, ENTRYWAY: No keys
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02, UNDERHALLS: 2 keys
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03, THE GANTLET: 2 keys
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04, THE FOCUS: 3 keys
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05, THE WASTE TUNNELS: 3 keys
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06, THE CRUSHER: 3 keys (blue key position varies by Skill level)
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07, DEAD SIMPLE: No keys
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08, TRICKS AND TRAPS: 2 keys
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09, THE PIT: 2 keys
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10, REFUELING BASE: 2 keys
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11, CIRCLE OF DEATH ('O' OF DESTRUCTION): 2 keys
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12, THE FACTORY: 2 keys
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13, DOWNTOWN: 3 keys
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14, THE INMOST DENS: 2 keys
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15, INDUSTRIAL ZONE: 3 keys
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16, SUBURBS: 2 keys
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17, TENEMENTS: 3 keys
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18, THE COURTYARD: 2 keys
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19, THE CITADEL: 3 keys
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20, GOTCHA!: No keys
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21, NIRVANA: 3 keys
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22, THE CATACOMBS: 2 keys
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23, BARRELS O' FUN: 1 key
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24, THE CHASM: 2 keys
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25, BLOODFALLS: 1 key
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26, THE ABANDONED MINES: 3 keys
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27, MONSTER CONDO: 3 keys
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28, THE SPIRIT WORLD: 2 keys
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29, THE LIVING END: No keys
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30, ICON OF SIN: No keys
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31, WOLFENSTEIN: No keys
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32, GROSSE: No keys
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