✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range ✓ Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
All prompt requirements implemented with correct physics (gold 19.32, gilded 11.30 g/cm³, same 1000g mass), a polished SVG layout, bubble/splash effects, and a theatrical Heureka overlay; the only weaknesses are the custom SVG drag-slider lacking native input feel and the crown submersion fraction using approximate pixel geometry rather than true volumetric clipping.
13,082 output tokens · claude-opus-4-6 · end_turn
All prompt requirements implemented with correct physics (gold 19.32, gilded 11.30 g/cm³, same 1000g mass), a polished SVG layout, bubble/splash effects, and a theatrical Heureka overlay; the only weaknesses are the custom SVG drag-slider lacking native input feel and the crown submersion fraction using approximate pixel geometry rather than true volumetric clipping.