✓ 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
Heureka only triggers when sliderPercent===100 AND lastSliderValue===100 simultaneously (always true at that point, so it works but logic is redundant); no smooth fall animation — crowns teleport instantly per slider tick rather than animating a fall arc.
Heureka only triggers when sliderPercent===100 AND lastSliderValue===100 simultaneously (always true at that point, so it works but logic is redundant); no smooth fall animation — crowns teleport instantly per slider tick rather than animating a fall arc.