Early on inSignalis, you’ll need to gather a bunch of items just to open a locked door. One requirement, in particular, tends to be more involved, as there are several related clues and tasks. Here’s ourSignalisguide to help you solve the Incinerator Room and Sword Safe puzzles, just so you can grab the Sword Key.
Note:For more information, check out ourSignalisguides and features hub. You can also check ourmain guidefor the 5-Lock Door puzzles.

Signalis: Sword Key, Sword Safe, and Incinerator Room puzzle guide
Radio frequency
If you want to open the Sword Safe inSignalis, you’ll need the all-important document from the Interrogation Room in the B2 section of the facility. This tells you the different frequencies that you can tune your radio to, which will then show a particular string of numbers. In my case, the Sword frequency was 244.000.

Note:It’s possible that some frequencies or codes will be different, so just consider this a general outline of what you need to watch out for.
Sword document

Next, you’ll find the Sword document on a chair in the B3 Waiting Room. It’s the same place that has the 5-Lock Door, the centerpiece puzzle in this chapter.
The document will show several letters and numbers, arranged akin to a keypad. However, one letter is blurred. I’ll explain more in a while.
Sword Safe puzzle
As for the Sword Safe, you’ll find it in the Nurse Station also in the B3 area (it’s at the end of the South Corridor). The Eule replicant is here, and the safe is at the back. It’s somewhat unique in that the selections are all letters instead of numbers.
Let’s recap:
With both of these clues, we can see that 14580 would be A-H-S-F-E. Press those letters in that sequence on the keypad, and hit the safe’s enter button to open it.
Inside, you’ll find the Eidetic Module and Incinerator Room Key. The former lets you take pictures so you can remember some clues (though simply taking a screenshot with your computer and checking your screenshot folder is more viable). The latter, meanwhile, is what we need for the next puzzle.
Incinerator Room puzzle
Make your way to the end of B3’s North Corridor to reach the Morgue. Run past the enemies and unlock the door using the Incinerator Room Key.
Inside, you’ll find a machine that has three components and a dial for each one — CO2, Gas, and O2.
The goal here is to set just the right amounts by moving the dials. you’re able to do this by clicking to the left or right of each dial to decrease or increase it respectively. Then, pull the lever to see the result.
As you can see in the image above:
There’s a bit of trial and error involved, so don’t worry about it. Once you get the correct result, you’ll be able to open the compartment to the right. This allows you to pick up the Sword Key inSignalis, and you’ll be one step closer to opening the 5-Lock Door.
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Jason Rodriguez
Jason Rodriguez is a guides writer. Most of his work can be found on PC Invasion (around 3,400+ published articles). He’s also written for IGN, GameSpot, Polygon, TechRaptor, Gameskinny, and more.
He’s also one of only five games journalists from the Philippines. Just kidding. There are definitely more around, but he doesn’t know anyone. Mabuhay!