All the official secret areas in the game are numbered and listed in the pages referenced below, along with the sector number and coordinates. "Official" secrets are those which are counted towards the "Secrets" total on the end level screen. Some non-secret areas which are hard to find are also listed, but are not numbered.
Click for a list of changes to other episodes in Ultimate Doom.
This list is also available in text format.
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Thy Flesh Consumed Secrets List / firstname.lastname@example.org