✓ 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 ASCII-art implementation with correct physics (Au 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), iterative water-rise computation, and splash particles, but there is no smooth fall animation — crowns teleport position instantly — and the ASCII rendering approach limits visual polish and makes the rising water level hard to read.
Solid ASCII-art implementation with correct physics (Au 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), iterative water-rise computation, and splash particles, but there is no smooth fall animation — crowns teleport position instantly — and the ASCII rendering approach limits visual polish and makes the rising water level hard to read.