✓ 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 per instructions ("move up to submerge") and uses CSS rotation rather than a native vertical slider, so top-of-slider does not naturally map to air; physics values (gold 19.32 g/cm³, gilded 13.5 g/cm³, same 1000 g mass) are plausible and consistent, and the Heureka/eureka overlay, live data panels, wave animation, splash particles, and bar comparison chart are all well-executed.
10,964 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted per instructions ("move up to submerge") and uses CSS rotation rather than a native vertical slider, so top-of-slider does not naturally map to air; physics values (gold 19.32 g/cm³, gilded 13.5 g/cm³, same 1000 g mass) are plausible and consistent, and the Heureka/eureka overlay, live data panels, wave animation, splash particles, and bar comparison chart are all well-executed.