✓ 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
All required features are implemented with correct physics (gold 19.32 g/cm³, gilded 13.15 g/cm³, same 1000 g mass) and a well-structured ASCII art scene, but the vertical slider has a double-registration bug (two `addEventListener('input', ...)` calls, one of which is overridden) and the crown submersion animation targets the water-surface row rather than visually sinking below it, limiting depth immersion fidelity.
8,975 output tokens · claude-opus-4-6 · end_turn
All required features are implemented with correct physics (gold 19.32 g/cm³, gilded 13.15 g/cm³, same 1000 g mass) and a well-structured ASCII art scene, but the vertical slider has a double-registration bug (two `addEventListener('input', ...)` calls, one of which is overridden) and the crown submersion animation targets the water-surface row rather than visually sinking below it, limiting depth immersion fidelity.