✓ 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 is rotated via CSS transform (not a native vertical input) and maps min=0→air, max=100→water, which is directionally correct by label but the physical left-to-right thumb movement maps to down-to-up visually making the UX feel inverted for some users; all other physics, live values, splash/ripple effects, and Heureka overlay are well-implemented.
11,114 output tokens · claude-opus-4-6 · end_turn
Slider is rotated via CSS transform (not a native vertical input) and maps min=0→air, max=100→water, which is directionally correct by label but the physical left-to-right thumb movement maps to down-to-up visually making the UX feel inverted for some users; all other physics, live values, splash/ripple effects, and Heureka overlay are well-implemented.