SIGNALIS Guide | How To Solve Coded Door Puzzle

A guide on how to solve the Coded Door puzzle in SIGNALIS.

Game Guide by Sabi on Feb 24, 2025

The final section of SIGNALIS, known as The Nowhere, is a horrific nightmare environment with coded door puzzles that must be completed in order to advance. These doors demand you to decipher radio frequencies and match them to symbols. If you're having trouble figuring out how to open them, this guide will take you through the full process step by step.

Finding a Frequency Device

Before you can begin solving the coded doors, you must first locate the frequency device. Here's how.

As usual, head to the right.
Drop down to the lowest level, where you last encountered the mid-cage monster. If you haven't battled it yet, prepare for a fight.
A microphone-equipped device can be found around this location. This is the secret to resolving the door riddles.

Using The Radio To Find Codes

SIGNALIS Guide, Using The Radio To Find Codes

Once you've located the device, follow these procedures to get the required codes:

Open your radio's menu and begin altering the frequency.
Pay close attention to the noises that are produced when you change the frequency.
Occasionally, you will encounter a frequency that generates a distinct sound.
When this occurs, inspect the monitor next to the microphone. A code will display on your screen.
This code corresponds to the signal shown in the picture above the buttons.

Recording The Codes

SIGNALIS Guide, Recording The Codes

Because you'll need numerous codes, it's important to record each one carefully:

When a new pattern emerges on the monitor, take a picture or screenshot.
Adjust the frequency again to locate the next signal.
Repeat the process, capturing a photo of each unique frequency configuration
Continue doing this until you have recorded all of the required codes.

Open the Coded Doors

SIGNALIS Guide, Open the Coded Doors

With your collected codes, it's time to unlock the doors.
As you explore The Nowhere, you will come across many doors with symbols.
Use the codes you've collected to match the correct frequency to the associated door symbol.
Input the codes into the panel near the doors

If you experiment with all of the combinations, you should be able to unlock all of the doors as long as you follow the correct sequence.

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