# Soned

> Free browser game for auditory memory and ear training: hear five synthetic sounds, then recreate pitch, waveform, volume, and duration with sliders. Scores go up to 999. Published by Eucomea.

Soned is a client-side web app (React, Vite; often deployed on Vercel). Interface language: English. Audio uses the Web Audio API via Tone.js. Play solo or share a multiplayer link—round parameters are encoded in the URL fragment so a friend can replay the same challenge without a dedicated game server. Free tier: limited plays per day. Premium: Firebase Authentication + Stripe for unlimited play.

**Scoring (short):** Each sound is scored on pitch, waveform, volume, and duration (weights vary by mode). Hard mode uses two stacked oscillators; scoring picks the best layer ordering. Full rules: in-app “Scoring” overlay.

**Privacy (short):** By default, scores and preferences stay in the browser; sign-in is mainly for Premium. Full text: in-app “Privacy & Legal” overlay (Eucomea, Nancy — RGPD/GDPR).

## Site

- [Home — play](https://soned.app/): Main experience. **JavaScript required.** HTML includes JSON-LD (`WebSite`, `Organization`, `WebApplication`, `FAQPage`) and Open Graph / Twitter metadata; card image: [`og-image.png`](https://soned.app/og-image.png).
- [Homepage Markdown mirror](https://soned.app/index.html.md): Plain Markdown parallel to `/` / `index.html` ([llmstxt.org pattern](https://llmstxt.org/)).
- [Full LLM context](https://soned.app/llms-full.txt): Long-form scoring, privacy, flows, tech stack.
- [Sitemap](https://soned.app/sitemap.xml): Canonical URLs for this SPA (typically home).
- [Robots](https://soned.app/robots.txt): Crawl hints and sitemap location.

## Media

- [Open Graph / social preview](https://soned.app/og-image.png): PNG, 1200×630.

## Optional

- [Tone.js](https://tonejs.github.io/): Synthesis / scheduling in the browser.
- [Web Audio API (MDN)](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API): Native browser audio APIs.
- [llms.txt proposal](https://llmstxt.org/): Spec for this file.