Corridor 9

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CORRIDOR 9 — A First-Person Anomaly Detection Horror Game

You are trapped in a secret underground facility with 25 sub-levels.

Each corridor looks normal at first glance — but anomalies hide in

plain sight.

A door that changed color. A picture that's been swapped. A hallway

that stretches impossibly long. An EXIT sign gone dark. Blood dripping

from the ceiling. Heavy rain pouring through the corridor.

Walk to the end of each corridor. Observe everything. At the exit

doors, make your choice:

  Press L — if you spotted something wrong (ANOMALY)

  Press R — if everything looks normal (NORMAL)

One wrong choice and the facility's defenses activate. Trust me —

you don't want to see what comes next.

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FEATURES:

• 25 procedurally generated corridors with unique layouts

• 8 different anomaly types:

    – Wrong door colors

    – Swapped wall pictures

    – Impossibly long hallways

    – Broken EXIT signs

    – Ajar/open doors

    – Flickering lights

    – Blood stains on walls

    – Heavy rain flooding the corridor

• Procedural 3D audio (no sound files) using Web Audio API:

    – Realistic footsteps

    – Escalating heartbeat

    – Environmental creaks and ambient dread

    – Rain, thunder, monster roars

• 6 unique monster attack sequences when you make the wrong choice:

    – Burst, Stalk, Slam, Phase, Ceiling Drop, Entrance Ambush

• Dynamic tension system that escalates as you descend deeper

• Victory escape animation with door opening + blinding white light

• Atmospheric horror visuals: vignette, chromatic aberration,

  screen shake effects

• Full 3D first-person perspective built with Three.js and WebGL

• No downloads, no installs — plays instantly in a new tab

• Completely free

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CONTROLS:

  WASD        — Move

  Mouse       — Look around (click to lock cursor)

  L key       — Exit LEFT (you spotted an anomaly)

  R key       — Exit RIGHT (everything is normal)

HOW TO PLAY:

  Level 1 is a tutorial that shows you a perfectly normal, anomaly-free

  corridor. Memorize it. From Level 2 onward, each corridor may contain

  1–3 hidden anomalies. Walk to the end, decide what you saw, and press

  L or R. 25 correct choices = you escape.