✓ 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
Slider direction is inverted for at least some browsers (min=0/value=0 maps to bottom in native vertical range, yet code treats val=0 as "crowns in air"), and fall animation is absent — crowns teleport linearly rather than falling with physics; otherwise physics values, Eureka animation, splash/bubble effects, and bilateral data panels are well-implemented.
11,498 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted for at least some browsers (min=0/value=0 maps to bottom in native vertical range, yet code treats val=0 as "crowns in air"), and fall animation is absent — crowns teleport linearly rather than falling with physics; otherwise physics values, Eureka animation, splash/bubble effects, and bilateral data panels are well-implemented.