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Doom/Walkthrough
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Ultimate Doom
Walkthrough is based on the I'm too Young to Die difficulty Level
EPISODE 1
Map 1: Hanger
Secrets: 3
Near the Exit there is a area of grey/brown wall in the middle of some green wall press space to open this part of the wall
In the room with the zig zag path though the acid pond, there is a demon on a high platform that flings fire balls at you, do not shoot it but run past into the next room, wait and then return about 45 seconds later, the platform will have lowered and the demon come off, you can now access the platform
(you must have done secret above before this one will work) just before the room with the acid pond there is a corridor with 2 areas of diagonal wall on the right, shoot each of these once with the shot gun and run too the platform (mentioned above) in the corner will be a lift to the 3 secret area. Actually you don't need to shoot the wall, you just need to retreat back from the room with the acid pond, then make a very fast beeline for the room revealed by secret #2. Use Shift-arrow to move the fastest. There is a lift that will come down for just a moment that will take you to a hidden corridor.
Map 2: Nuclear Plant
Map 3: Toxin Refinery
Map 4: Command Control
Map 5: Phobos Lab
Map 6: Central Processing
Map 7: Computer Station
Map 8: Phobos Anomaly
Map 9: Military Base