✓ 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
Exceptionally complete implementation with correct physics (19320/11300 kg/m³, same 1000g mass), ripple/splash/bubble effects, live bar-chart comparison, Heureka overlay with Archimedes figure, and click-to-jump slider — minor weakness is the SVG custom slider (no native range input) whose drag coordinate math can drift when the viewport scales.
14,732 output tokens · claude-opus-4-6 · end_turn
Exceptionally complete implementation with correct physics (19320/11300 kg/m³, same 1000g mass), ripple/splash/bubble effects, live bar-chart comparison, Heureka overlay with Archimedes figure, and click-to-jump slider — minor weakness is the SVG custom slider (no native range input) whose drag coordinate math can drift when the viewport scales.