Screenshots
Watch trailer on Steam ↗Signal
Ruldae · Published by Ruldae · Official site ↗
4 user reviews — 50% positive (4 reviews) · 17 achievements
Last updated 28 Sept 2026
Route messages at a remote station's CRT console, choose your responses, and infer the protocol from clues hidden in the signals. Every cycle brings the quiet threat closer through traces left by previous operators.
£1.79
Lowest price we've ever recorded
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Price history
Adventure, Indie, Simulation, Casual · 2026 · More under £5 games
About this game
Feature List
Clue-driven channel routing and response decisions
A protocol learned through traffic and altered across cycles
Persistent operator notes, discoveries, archive, and statistics
An endless shift with three optional outcomes that do not end the game
Danger-reactive CRT presentation and procedural audio identity
Mouse and keyboard support with accessibility options
In-game interface and text support for 29 languages
About the Game
The night shift has begun. The console is open. All you have are incoming messages, notes from previous operators, and the decisions the system expects from you.
SIGNAL is an atmospheric terminal game built around reading and inference. Examine every transmission, understand the source's behavior, choose the appropriate channel or response, and observe the consequence at the station. The protocol is never handed to you as a list: the first shift teaches the basic operations through live traffic, while the remaining rules must be inferred from patterns.
Read the signal. Infer the rule. Make the call.
Examine frequencies, codes, deviations, and language patterns in incoming transmissions.
Route each message to the right channel or choose the appropriate operator response.
Compare source behavior and record discovered rules in your operator notes.
Keep the console stable as wrong decisions increase danger and terminal distortion.
Every shift leaves a trace
As cycles advance, traffic, rules, and the station's behavior change. Lines left by previous operators, your own notes, discoveries, and statistics await you on later shifts. Operators who remain at the console long enough may encounter three optional outcomes that can be recorded without ending the shift. Recording an outcome does not end the game: the line stays open and the shift continues.
A quiet station. A live terminal.
A live CRT console sits inside an original station room, with three phosphor profiles, danger-reactive distortion, and procedural terminal audio that responds to the game's decisions. As you approach CONTACT, the reliability of the screen and its audio layers begins to change.
Keep control in your hands
Keyboard and mouse support
Reduced CRT effects
Reduced motion
High contrast mode
Timing assist for messages
Windowed and fullscreen play
Operator archive, persistent notes, and detailed statistics
Interface and text support for 29 languages
Steam achievements and an anonymous operator depth leaderboard
The system will not tell you how many cycles you can endure. Only the next signal arrives.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 64-bit
- Processor: Intel Core i3-6100 / AMD Ryzen 3 1200
- Memory: 2048 MB RAM
- Graphics: Intel HD Graphics 620 / AMD Radeon R5
- DirectX: Version 11
- Storage: 200 MB available space
- Additional Notes: 1280x720 minimum resolution
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows 10 64-bit
- Processor: Intel Core i5-6400 / AMD Ryzen 5 1600
- Memory: 4096 MB RAM
- Graphics: Intel UHD Graphics 630 / AMD Radeon RX 550
- DirectX: Version 11
- Storage: 200 MB available space
- Additional Notes: 1920x1080
Supported Languages
Latest news
Patch NotesOfficial
SIGNAL 2.01
Incorrect decisions now show the expected channel and response.Resolved ambiguous KA9 responses and inconsistent OP2 routing clues.Messages no longer target unavailable channels, and long CONTACT sequences leave one usable channel.Completed missing gameplay and interface localizations.Added subtle station ambience, rain, and tower-light movement.Thank you for your feedback.Read full article on Community Announcements (RD)AnnouncementsOfficial
SIGNAL 2.0 - The Station Wakes Again
The operator console has been reinstalled.SIGNAL was initially released as a small, experimental terminal game. In the 2.0 update, we kept the idea at the heart of the game: reading messages from unknown sources, deciphering their behavior, and trying to make the right decision inside an undisclosed system. We have comprehensively renewed the presentation, learning flow and long-term gameplay around this.New station and CRT presentationThe main menu, game screen, pause, settings, archive and statistics screens have been combined into a common station visual identity.The live terminal interface was built into the physical CRT chassis.Improved composition preservation during windowed use, resizing, and full-screen transitions.P31 green, P3 amber and P4 white phosphor profiles were adapted to the entire CRT surface.SIGNAL and RULDAE opening presentations have been renewed; Fixed background glow appearing before the game starts.Redesigned first shiftFirst shift now offers a directed flow that teaches basic channel and response decisions within traffic.The wrong decision or timeout does not silently skip the teaching step; The same signal arrives safely again.A controlled time limit has been added to prevent the first shift from becoming unnecessarily long.Channel error and response/posture error were distinguished; The player can see more clearly which decision creates a problem.Increased reading time and visibility of wrong decision feedback.Stronger signal routing loopReduced message duplication and added a larger variety memory per source.Correct decisions create `1/3` and `2/3` progress traces in resource patterns.The discovered rules become visible in the terminal, operator logs and statistics.The opening rhythms of the cycles and brief operational information were separated from each other.Message, audio and loop tempo have been re-adjusted to reduce the feeling of repetitive traffic over long sessions.Operator archive and recordsThe archive is no longer just a li...Read full article on Community Announcements (RD)Patch NotesOfficial
SIGNAL v1.1
Added Ruldae curator page button to the main menu. Various interface fixes and improvements.Read full article on Community Announcements (RD)AnnouncementsOfficial
Signal — Out Now
// RÆLOS Communication Management System// Operator Console - StandbySignals arrive from unknown sources.You route them. You log them. You keep the system running.What the signals mean - that is not your concern.Understand them anyway.SIGNAL is available now.29 languages supported.- RÆLOS SystemsRead full article on Community Announcements (RD)
