How to play

Your index and middle fingertips (both hands) are the mallets. Poke them into the key zone at the bottom of the frame to strike — sounds are synthesized locally with WebAudio, so turn your speakers on.

rhythm run — 60 seconds of notes falling down 4 lanes. Strike the lane as the note crosses the dashed line: within 70 ms is a perfect (100+ points), within 170 ms a good. Misses reset the combo. Stray presses are free — flail away.
free play — a C-major octave (C–D–E–F–G–A–B–C) across the bottom of the frame. No timer, no score.

Privacy

The camera turns on only after you pick a mode, and the light goes off the moment you hit stop camera or leave the page. Frames are processed by a WASM model served from this site, and the audio is generated in your browser — nothing is uploaded, no account, no tracking of any kind on your input. Verify it yourself: open DevTools → Network while playing and watch nothing leave.

Requirements

A webcam, speakers or headphones, and a reasonably recent browser (Chrome, Edge, Firefox, Safari 16+). The tracker prefers your GPU and falls back to CPU. First load fetches ~18 MB of model + WASM once, then it's cached.