Screenshots
Watch trailer on Steam ↗In Silent Walls : Sujet 13
Hollow Signal Games · Published by Hollow Signal Games · Official site ↗
Content notice: This game contains psychological horror themes, disturbing environments, as well as depictions of blood and past crimes. It may also include mild coarse language. Not recommended for children or sensitive players.
Positive — 94% positive (18 reviews) · 5 achievements
Last updated 28 Sept 2026
Explore the decayed corridors of a haunted sanatorium, uncover disturbing documents, and face the paranormal horrors and restless spirits that linger within its walls.
£4.99
Lowest price we've ever recorded
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Price history
Adventure, Indie · 2025 · More under £5 games
Navigate the eerie halls of a haunted sanatorium and uncover dark secrets in In Silent Walls : Sujet 13. Explore, document, and confront the supernatural terrors lurking within its decaying walls.
About this game
In Silent Walls: Subject 13 is a first-person psychological horror narrative game.
Twenty years after the disappearance of your sister Elina, you return to the abandoned Red Hollow Sanatorium to face the past and uncover the truth hidden within its silent walls.
Explore decayed corridors, discover disturbing documents and drawings, and slowly piece together the story . Every step brings you closer to the truth… and to madness.
Because within these walls, the past is not just a memory… it is waiting for you.
Features:
An immersive and realistic atmosphere powered by Unreal Engine 5.
A dark, story-rich narrative, revealed through letters, documents, and the environment.
Exploration and light puzzles to progress through the story.
Terrifying and unsettling scenes, focused on psychological horror rather than gore.
In Silent Walls: Subject 13 is an independent, family-driven project developed in France. More than just a game, it’s the realization of a childhood dream. Thank you to everyone supporting indie horror.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 64-bit
- Processor: Intel Core i5-8400 / AMD Ryzen 3 3300X
- Memory: 8 GB RAM
- Graphics: NVIDIA GeForce GTX 1060 / AMD Radeon RX 580 (4GB VRAM)
- DirectX: Version 12
- Storage: 20 GB available space
- Sound Card: Compatible with DirectX
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows 10/11 64-bit
- Processor: Intel Core i7-9700K / AMD Ryzen 5 5600X
- Memory: 16 GB RAM
- Graphics: NVIDIA RTX 2060 / AMD Radeon RX 6600 XT (6–8 GB VRAM)
- DirectX: Version 12
- Storage: 20 GB available space
- Sound Card: Compatible with DirectX
Supported Languages
*languages with full audio support
Latest news
AnnouncementsOfficial
New Bundle Available with Backrooms Level X!
Great news! A brand new Steam bundle featuring In Silent Walls: Sujet 13 and Backrooms Level X is now available!If you enjoy tense, atmospheric horror experiences, this is a great opportunity to discover two different indie horror games while enjoying an extra discount. A huge thank you to the Backrooms Level X team for this collaboration! If you haven't checked out their game yet, be sure to take a look. And if you enjoyed In Silent Walls: Sujet 13, this bundle is a great way to support two passionate indie developers.Thank you all for your incredible support, and stay tuned... more surprises are on the way! See you soon in the halls of Red Hollow. Hollow Signal GamesRead full article on Community Announcements (H̶o̷l̵l̶o̷w̴ Signal Games)AnnouncementsOfficial
Our First Steam Bundle is Live!
Hello everyone!We're happy to announce the very first Steam bundle for In Silent Walls: Sujet 13!We've teamed up with the developer of After Prologue to create a bundle for players who enjoy atmospheric indie horror experiences.If you've been thinking about discovering both games, now is the perfect opportunity.Thank you so much for your support. More is coming for the world of In Silent Walls. A big thank you to the developer of After Prologue for making this first bundle possible!Read full article on Community Announcements (H̶o̷l̵l̶o̷w̴ Signal Games)AnnouncementsOfficial
In Silent Walls: Origines is now available to wishlist on Steam.
After In Silent Walls: Sujet 13, I’m very happy to announce that the next game in the series, In Silent Walls: Origines, now has its own Steam page.This time, the story will take you long before the events of Sujet 13, into a new nightmare connected to the Ashford Manor. A darker atmosphere, a richer world, and a more ambitious experience await you.If you would like to support the project right now, you can add it to your wishlist here: A huge thank you to everyone who continues to support the In Silent Walls universe. Your support, your messages, and your wishlists truly help the series grow. ❤️ Hollow Signal GamesRead full article on Community Announcements (H̶o̷l̵l̶o̷w̴ Signal Games)Patch NotesOfficial
Major Performance Update
In Silent Walls: Subject 13 — Major Performance UpdateAfter weeks of deep optimization, I’m proud to release a major performance update focused on stability and smoother gameplay.What’s new Global GPU optimization (lighting, Lumen, heavy scenes) Fully optimized outdoor foliage Lighting system refactorRect Lights removedFlickering lights converted to Point LightsSecondary lights optimized Level cleanup & streaming fixes (hidden duplicates removed) Much more stable FPS ResultLower GPU usageLess stutterA smoother, more immersive experienceThank you all for your support. This is my very first game, and your feedback pushed me to keep improving it. Thank you for being here.Read full article on Community Announcements (H̶o̷l̵l̶o̷w̴ Signal Games)AnnouncementsOfficial
Thank you !!!
I just wanted to take a moment to say thank you.In Silent Walls is my very first game, and thanks to your feedback, I’ve been able to make a few improvements to enhance the experience.I’d like to thank all the players, as well as the creators and streamers who take the time to discover and share the game.Your support, messages, and curiosity truly mean a lot to me.Thank you for giving this very personal project a chance.Rudy / Hollow Signal GamesWishing you all a wonderful holiday season. ːsteamhappyːRead full article on Community Announcements (H̶o̷l̵l̶o̷w̴ Signal Games)
