✓ 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
Impressively complete ASCII-art implementation with correct physics (Au 19.3 g/cm³ vs 13.0 g/cm³, same 1000 g mass), working splash particles, rising water levels, and Heureka trigger — but the custom drag-only slider (no native range input) can feel fiddly, and the ASCII crown rendering occasionally clips against container walls.
6,967 output tokens · claude-opus-4-6 · end_turn
Impressively complete ASCII-art implementation with correct physics (Au 19.3 g/cm³ vs 13.0 g/cm³, same 1000 g mass), working splash particles, rising water levels, and Heureka trigger — but the custom drag-only slider (no native range input) can feel fiddly, and the ASCII crown rendering occasionally clips against container walls.