{
  "engine": "Planck.js 1.5.0 / Box2D",
  "units": "metres, seconds",
  "gravity": 0.5,
  "radii": [
    1.65,
    2.75,
    3.85
  ],
  "gap": 1.05,
  "angularSpeeds": [
    0.23,
    -0.16,
    0.11
  ],
  "ballRadius": 0.12,
  "restitution": 1,
  "friction": 0,
  "initialSpeed": 2.2,
  "preludeMs": 0,
  "durationMs": 60000,
  "deadlineSeconds": 60,
  "timestepSeconds": 0.008333333333333333,
  "continuousCollisionDetection": true,
  "segmentsPerRing": 84,
  "settlement": "Yes when the entire ball clears outer radius plus 0.04 m detection tolerance at or before 60 physical seconds; No otherwise.",
  "motorDrivenRings": true,
  "audio": "Each measured collision impulse creates a tuned note; surface, impulse strength and horizontal position set pitch, loudness and pan.",
  "cooldownMs": 3000,
  "roundTiming": "Launch immediately; resolve on escape or the 60-second deadline; show the result for 3 seconds, then launch the next ball."
}