✓ 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 (min=0 at top maps to air, but the CSS uses rotate(-90deg) with writing-mode bt-lr making the visual top correspond to the higher value, causing confusing UX); physics values are sound (gold 19.32 g/cm³, mixed 13.15 g/cm³, same 1000 g mass), and nearly all requested features are genuinely implemented including heureka overlay, splash particles, ripples, rising water level, and live data panel.
10,341 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0 at top maps to air, but the CSS uses rotate(-90deg) with writing-mode bt-lr making the visual top correspond to the higher value, causing confusing UX); physics values are sound (gold 19.32 g/cm³, mixed 13.15 g/cm³, same 1000 g mass), and nearly all requested features are genuinely implemented including heureka overlay, splash particles, ripples, rising water level, and live data panel.