Stillwater Echo Watch
Copyright 2026. New interface, runtime and practice, GPL-3.0-or-later.
Sequence generator and corrected-recognition scoring adapted from Dual-N-Back by Jonathan Perry-Houts.
Source: https://github.com/jperryhouts/Dual-N-Back
Commit: 90e67197cbe80c871dd3cd7123c92cb3ad62db5f (version 0.11.6).
Modifications: ESM pure-function wrapper and injected RNG; new static DOM interface, tutorial, pause, caption mode, controls, device scores. No service worker, analytics, downloads, or backend.
Full corresponding modified source is the readable index.html, style.css, app.js and engine.js served alongside this notice. No build step or dependencies. GPL license in LICENSE.txt.
Speech: optional browser speech synthesis restricted to installed local English voices. Captions are used when no local voice is available. No recorded audio or remote voice service is used.
Visual assets: wetland.webp and birds.webp generated for this run with the built-in GPT image tool, optimized to WebP with alpha preserved.
Metadata tags: github-source, game.