ECHO-9: HYPOXIA

"DAILY PROTOCOL: Every transmission MUST start with the callsign ECHO-9. If they don't say it, DO NOT open the valves."

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SYNOPSIS

Deep inside a subterranean research complex, an accident triggers a complete sector lockdown. Trapped inside the central terminal room, you are the only operator left.

A voice reaches through the static: Miller, an engineer trapped in the darkness of Sector 4 who will need your help to make it out of the tunnel system alive.

But the air filtration system is degrading, CO2 levels are rising, and other frequencies are bleeding into your console, yelling to tell you lies, or are they not?

Can you trust the voice on the radio? Can you even trust your own senses?

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KEY FEATURES

• Diegetic 2.5D Cockpit Perspective: Your entire world is the control panel in front of you.
• Radio Tuning and Signal Verification: Align oscilloscope frequencies to filter critical transmissions from audio hallucinations.
• Manual Pressure and Life Support Balancing: Calibrate fluctuating sector valves and manually pump toxic CO2 out of your own station before hypoxia sets in.
• Multiple Endings: A short, intense narrative thriller driven by protocol, moral guilt, and paranoia.

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CONTROLS

• Mouse Look: Inspect the terminal consoles and physical protocol notes.
• Left Click: Toggle switches, calibrate pressure valves, and tune radio frequencies.
• Number Keys 1 / 2 and Spacebar: Select dialogue response channel and hold to transmit (PTT).
• Headphones Recommended: Spatial audio and radio interference are crucial to gameplay.

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Created for the Brackeys Game Jam 2026.2.