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eco

A free browser game — play it in your browser, no install. Echolocation browser game in vanilla JavaScript: ping a pitch-black cave and find the exit by ear

by @Fede-Berga · Fede-Berga/eco on GitHubLANG JavaScriptHOSTED ON FEDE-BERGA.GITHUB.IOUPDATED 31 Oct 2026

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Best with a keyboard. Controls: Press SPACE to emit a

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From the README

A tiny browser game about echolocation, written in vanilla JavaScript — no dependencies, no build step.

Play it in your browser

You are a small creature lost in a pitch-black cave. Press SPACE to emit a ping: the sound wave expands outward and briefly lights up the walls it touches. When a wave crosses the exit you hear a chime — panned toward it, louder the closer you are. Navigate by memory and by ear.

From level 2 onward something else lives in the cave. It is blind too, but it hears your pings through the rock — and it comes looking. Pings reveal it only as a snapshot of where it was.

Read the full README on GitHub →

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