✓ 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 in a cohesive ASCII-art renderer; the custom drag-thumb slider lacks a native range input and has slightly clunky UX, and mass/density values are static rather than live-updating, but physics ratios (51.8 vs 76.9 cm³, proportional water rise) are internally consistent and the heureka overlay triggers correctly at t>0.98.
6,442 output tokens · claude-opus-4-6 · end_turn
All required features are implemented in a cohesive ASCII-art renderer; the custom drag-thumb slider lacks a native range input and has slightly clunky UX, and mass/density values are static rather than live-updating, but physics ratios (51.8 vs 76.9 cm³, proportional water rise) are internally consistent and the heureka overlay triggers correctly at t>0.98.