✓ 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 major features implemented correctly with solid physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass, correct displacement difference), but water-rise pixel scaling (PX_PER_CM3=0.52) is an arbitrary visual constant rather than a geometrically derived value, and mass/density data rows are static HTML rather than dynamically updated.
8,066 output tokens · claude-opus-4-6 · end_turn
All major features implemented correctly with solid physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass, correct displacement difference), but water-rise pixel scaling (PX_PER_CM3=0.52) is an arbitrary visual constant rather than a geometrically derived value, and mass/density data rows are static HTML rather than dynamically updated.