✓ 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
All core features are genuinely implemented in a single SVG/JS file with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass, proportionally larger gilded volume and displacement); minor weakness is that mass/density/volume readouts are static constants rather than dynamically computed from submersion state, and the water-rise pixel scale (0.4 px/cm³) makes the differential visually subtle.
10,287 output tokens · claude-opus-4-6 · end_turn
All core features are genuinely implemented in a single SVG/JS file with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass, proportionally larger gilded volume and displacement); minor weakness is that mass/density/volume readouts are static constants rather than dynamically computed from submersion state, and the water-rise pixel scale (0.4 px/cm³) makes the differential visually subtle.