✓ 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
Near-complete implementation with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass), live displacement/buoyancy readouts, wave + splash effects, and a Heureka overlay — mass/volume/density panels are static rather than dynamically updating, and the water-rise visual scaling uses an arbitrary tank cross-section constant that underrepresents actual displacement, but the crown-entry logic and slider direction (top=air, bottom=water) are correct throughout.
8,622 output tokens · claude-opus-4-6 · end_turn
Near-complete implementation with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass), live displacement/buoyancy readouts, wave + splash effects, and a Heureka overlay — mass/volume/density panels are static rather than dynamically updating, and the water-rise visual scaling uses an arbitrary tank cross-section constant that underrepresents actual displacement, but the crown-entry logic and slider direction (top=air, bottom=water) are correct throughout.