Corridor 9
First-Person Horror · Anomaly Detection · 25 Levels · Free to Play
About This Game
Corridor 9 is a first-person anomaly detection horror game that will test your observation skills and nerves. You are trapped in a facility with 25 procedurally generated sub-levels. Each corridor looks normal — but anomalies hide in plain sight. A door that's the wrong color. A picture that's been swapped. A hallway that stretches impossibly long. An EXIT sign that's gone dark.
Your job is simple but terrifying: walk to the end of each corridor, observe carefully, and decide. If you spotted something wrong, exit LEFT. If everything is normal, exit RIGHT. One wrong choice and the facility's defenses activate — and you won't like what comes for you.
Built with Three.js, this game features immersive 3D visuals, dynamic sound design, and a tension system that escalates as you descend deeper. It's completely free to play with no downloads required. Can you spot the anomalies and survive all 25 levels?
Anomaly Types
8 different anomalies can appear in the corridors:
- Wrong door colors — A door that doesn't match the facility's color scheme
- Swapped pictures — Artwork that has been replaced or altered
- Impossibly long hallways — Corridors that stretch far beyond normal length
- Broken EXIT signs — Emergency signs that are dark or damaged
- Ajar doors — Doors that are slightly open when they shouldn't be
- Flickering lights — Lighting that pulses or fails intermittently
- Blood stains on walls — Disturbing marks that shouldn't be there
- Heavy rain — Weather effects that appear inside the facility
Game Features
- 25 Procedurally Generated Levels — Each playthrough is unique
- 8 Anomaly Types — A variety of subtle and not-so-subtle clues to detect
- Immersive 3D Sound Design — Footsteps, heartbeats, creaks, rain, thunder, and monster roars
- Dynamic Monster Attacks — 6 unique patterns (burst, stalk, slam, phase, ceiling drop, entrance ambush)
- Tension System — Anxiety escalates as you descend deeper into the facility
- Victory Escape Animation — A dramatic door opening with blinding light upon completion
- Atmospheric Horror Visuals — Vignette, chromatic aberration, and screen shake effects
- No Downloads — Play instantly in your browser
The Horror Experience
Corridor 9 is designed to keep you on edge. The game's tension system ensures that the deeper you go, the more unsettling the experience becomes. Environmental sounds — creaks, footsteps, heartbeats — build an atmosphere of dread. The monster attack sequences are sudden, varied, and terrifying.
Success depends on your attention to detail. Every level presents a new corridor with subtle clues. You must decide: is this corridor safe, or is something wrong? One wrong choice can be fatal. The game rewards careful observation and punishes complacency.
Why Play Corridor 9?
If you enjoy horror games that focus on psychological tension and observation, like FNAF, Outlast, or Amnesia, Corridor 9 will captivate you. The game's unique blend of procedural generation, anomaly detection, and immersive horror creates a fresh experience every time you play.
The anomaly detection mechanic is a clever twist on the horror genre — it rewards attentiveness and memory, rather than just reflexes. The procedural generation ensures that no two playthroughs are the same, adding significant replay value.
This indie-developed game is a showcase of what's possible with Three.js. With its atmospheric visuals, dynamic sound design, and escalating tension, Corridor 9 is a must-play for horror fans looking for a unique and challenging experience.
How to Play
- Mouse Look — Look around the corridor to inspect for anomalies
- WASD / Arrow Keys — Walk forward and backward in the corridor
- Left Mouse Click — Select LEFT (anomaly detected) or RIGHT (normal) at the end of each corridor
- Fullscreen Mode — Click the button above for maximum immersion
Pro Tip: Take your time in each corridor. Move slowly and look at everything — doors, pictures, signs, lighting. If something feels off, it probably is. The anomalies can be subtle, but they are always there. Trust your instincts, but rely on your observation. Good luck — you'll need it!
