Doom level E2M4, Deimos Lab: Last-Secret bug
24Shows how a fast-moving player might lose access to a Secret platform near the exit in PC Doom/Ultimate Doom level E2M4, Deimos Lab. Note that it's often still possible to 'bump-grab' the Soul Sphere seen here, but in order to get credit for discovering this secret area, the player must be able to step up onto that platform.
To reach the platform, a player must activate a pair of slow-rising bridges. The first bridge connects the far side of the lava pit to the exit door, and is activated by a switch in a small booth located below and left of the exit door. The second bridge connects the first bridge to the Secret platform, and is activated when the player walks up to the exit door.
A potential problem is that the second bridge is programmed to rise to whatever height that the first bridge was at when the second was activated. This means that if the first bridge had not yet reached its maximum height when the second was activated, then the second bridge won't reach its own maximum height. This situation can make the Secret platform inaccessible.
(Typically a player activates the switch for the first bridge, then steps into the teleporter next to it in order to escape the pit and eventually get back to the exit door. This procedure gives more than enough time for the first bridge to finish rising before the second can be activated.)
Notes on the making of this demo: This was made in single-player Deathmatch mode to allow the player to start closer to the exit, and with all 3 keys already acquired.
See https://classicdoom.com/maps/d1secs/e2m4.htm for a map of all score-affecting Secrets.
This is an excerpt from a video conversion of the .lmp file E2M4XBUG at ClassicDOOM.com:
https://classicdoom.com/d1demos.htm#e2m4xbug
Timestamps:
0:00 - Approaching exit of E2M4
0:03 - Bridge 1 activated
0:06 - Bridge 2 activated early
0:08 - Bridge 2 stopped short
0:11 - Player cannot step up
0:13 - See description for details
This video is part of the ClassicDOOM 'Doom/UDoom solutions' playlist:
https://www.youtube.com/playlist?list=PL7AE56D17E37A2B7F
#doom #ultimatedoom #classicdoom
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