✓ 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
Highly complete implementation with correct physics (gold 19.3 g/cm³, gilded 11.0 g/cm³, same 1000 g mass), working custom SVG drag-slider, rising water levels, splash/bubble effects, buoyancy force values, comparison bars, and a triggered Heureka overlay — the main weakness is the non-standard slider (SVG drag rather than a native range input) which can be finicky, and the submerged-fraction calculation bypasses the geometric crown-water intersection in favor of a linear t-remap starting at t=0.3.
13,570 output tokens · claude-opus-4-6 · end_turn
Highly complete implementation with correct physics (gold 19.3 g/cm³, gilded 11.0 g/cm³, same 1000 g mass), working custom SVG drag-slider, rising water levels, splash/bubble effects, buoyancy force values, comparison bars, and a triggered Heureka overlay — the main weakness is the non-standard slider (SVG drag rather than a native range input) which can be finicky, and the submerged-fraction calculation bypasses the geometric crown-water intersection in favor of a linear t-remap starting at t=0.3.