✓ 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
Fully-featured ASCII-art demo with correct Archimedes physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), live data panel, splash effects, rising water level, and Heureka trigger — but the ASCII rendering limits visual polish and the splash logic decrements before drawing, making it flicker rather than sustain.
Fully-featured ASCII-art demo with correct Archimedes physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), live data panel, splash effects, rising water level, and Heureka trigger — but the ASCII rendering limits visual polish and the splash logic decrements before drawing, making it flicker rather than sustain.