The Sinking City 2 Brain Puzzle, or the Wireless Room puzzle, is an optional challenge in Chapter 3: A Sight for Sore Eyes. Solving this puzzle unlocks The Whisperer trophy/achievement. Let’s see what you must do to complete the Wireless Room investigation!
How to Solve The Sinking City 2 Brain Puzzle in the Wireless Room
The Wireless Room is an optional area you can enter after unlocking the Medical Records room as part of the story.

Inside the Wireless Room, you can see three brains connected to machines. Talking to the three brains reveals the clues that help discover the frequency numbers needed to solve the Brain Machine investigation and unlock The Whisperer trophy.
How to Decipher the Clues and Complete the Brain Puzzle
Talk to each brain to receive the following testimonies:
- Cornelius Wright says that the secondary frequency is higher than the primary and the primary is well above 20. He also tells you not to believe Pence.
- Ambrose Pence says that the primary frequency is between 10 and 20 and the number brings bad luck on Friday. The third frequency is double the sum of the first two. He also says that Dunwich is half correct.
- Silas Dunwich says that to obtain the secondary frequency, you must round the primary frequency to the nearest 10 and cut it in half. The tertiary is under 30. He also says that Wright is always wrong.
Notice that you can interact with the machine to input the frequency numbers. Inputting the correct number results in a green light. This is another clue that will help you solve The Sinking City 2 Brain Puzzle investigation. Pence’s clue on the primary frequency hints at the number 13. Input 13 and notice the green light. This means that Pence is right and Wright is wrong.

Following Dunwich’s clue, round the first frequency (13) to the nearest 10 to get 10. Cut it in half (divide it by 2) to get 5. Input 05 into the machine to get a green light.

Dunwich was right about the secondary frequency and about Wright being always wrong. Pence says that Dunwich is half correct, meaning that his other clue about the tertiary being under 30 is wrong. Follow Pence’s clue to obtain the third frequency: (13 + 5) x 2 = 36. Input 36 into the machine to solve the puzzle.

The Whisperer trophy/achievement will pop up after a short cutscene. You will also get a Dream Essence as a reward.
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