✓ 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 major features implemented with correct physics (1000g, ρ_gold=19.32, ρ_fake=11.0, proper displaced-volume tracking) and polished SVG visuals, but the slider is an SVG drag target rather than a native input, making it somewhat finicky, and the water-level rise is artificially exaggerated (PX_PER_CM scaling) rather than geometrically consistent with the crown's actual pixel volume.
12,993 output tokens · claude-opus-4-6 · end_turn
All major features implemented with correct physics (1000g, ρ_gold=19.32, ρ_fake=11.0, proper displaced-volume tracking) and polished SVG visuals, but the slider is an SVG drag target rather than a native input, making it somewhat finicky, and the water-level rise is artificially exaggerated (PX_PER_CM scaling) rather than geometrically consistent with the crown's actual pixel volume.