✓ 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 (transform:rotate(180deg) + bt-lr writing-mode means top=water, bottom=air, contradicting the LUFT↑/WASSER↓ labels and prompt requirement); all other features are solidly implemented with correct physics (Au 19.32 g/cm³, gilded 13.15 g/cm³, same 1000g mass, larger displaced volume for gilded crown) and a well-animated multi-phase Eureka overlay.
8,466 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (transform:rotate(180deg) + bt-lr writing-mode means top=water, bottom=air, contradicting the LUFT↑/WASSER↓ labels and prompt requirement); all other features are solidly implemented with correct physics (Au 19.32 g/cm³, gilded 13.15 g/cm³, same 1000g mass, larger displaced volume for gilded crown) and a well-animated multi-phase Eureka overlay.