✓ 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
Near-complete implementation with correct Archimedes physics (same mass 1000g, gold 19.32 g/cm³ vs gilded 11.0 g/cm³, proportional displacement), live data panels, splash/ripple particles, and Heureka animation — minor flaw is the custom SVG drag-slider (not a native range input) which can feel imprecise and lacks snap/reset, and the crown vertical travel compresses the air→water transition into the 0.45–0.85 slider band rather than the full range.
12,724 output tokens · claude-opus-4-6 · end_turn
Near-complete implementation with correct Archimedes physics (same mass 1000g, gold 19.32 g/cm³ vs gilded 11.0 g/cm³, proportional displacement), live data panels, splash/ripple particles, and Heureka animation — minor flaw is the custom SVG drag-slider (not a native range input) which can feel imprecise and lacks snap/reset, and the crown vertical travel compresses the air→water transition into the 0.45–0.85 slider band rather than the full range.