✓ 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
Strong, complete implementation with correct physics (gold 19.32 g/cm³, gilded 13.07 g/cm³, same 1000g mass), live data panel, and a polished Heureka overlay — but the "fall animation" is a linear interpolation rather than a true gravitational drop, and both crowns share the same Y-position/immersion fraction instead of being independently controlled, which slightly undermines the visual comparison of differential water displacement.
12,782 output tokens · claude-opus-4-6 · end_turn
Strong, complete implementation with correct physics (gold 19.32 g/cm³, gilded 13.07 g/cm³, same 1000g mass), live data panel, and a polished Heureka overlay — but the "fall animation" is a linear interpolation rather than a true gravitational drop, and both crowns share the same Y-position/immersion fraction instead of being independently controlled, which slightly undermines the visual comparison of differential water displacement.