✓ 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
Solid, well-structured implementation with correct Archimedes physics (same mass, gold ρ=19.3 vs gilded ρ=13.0, larger volume displaces more water), but lacks a true falling animation — crowns teleport smoothly via slider rather than animating a drop, and the splash only triggers on the crossing threshold rather than a genuine physics-driven fall event.
Solid, well-structured implementation with correct Archimedes physics (same mass, gold ρ=19.3 vs gilded ρ=13.0, larger volume displaces more water), but lacks a true falling animation — crowns teleport smoothly via slider rather than animating a drop, and the splash only triggers on the crossing threshold rather than a genuine physics-driven fall event.