After obtaining secret #2, as shown in the previous section, proceed to the next room, on the left opposite the hallway with the dart traps.
Here you'll find a block with a switch on it and two closed doors beyond. Approach each of the doors...
...to awaken a mutant on the other side.
Go to the switch, flip it, then quickly hop back and take a standing jump onto the block.
You can then kill the 2 mutants (20-21) safely with pistols. If they run away, just hang briefly from the edge of the block to get their attention. Then quickly pull up and continue shooting.
Afterwards, pick up 4 boxes of shotgun shells (36-39) in the little, fleshy rooms where the mutants originated.
There are two other rooms that connect to the one with the switch block. The one to the east has a cage with 4 mutants (22-25) (not yet active) and a switch.
The one to the northwest has a set of tall block steps and a small pool of water. There's also a red lattice window high on the west wall. You'll reach that area later from the other side. Enter the southwest room first.
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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