✓ 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 direction is inverted (dragging down = deeper into water, but the label at top says "Luft/Air" and bottom says "Wasser/Water" — top value 0% maps to crowns in air and bottom 100% maps to crowns submerged, which is technically correct labeling but the handle starts at the top for 0% meaning air, so direction IS arguably correct; however the SVG drag maps local Y increasing downward so slider bottom = water = deeper, which matches — re-examining: val=0 → crown at CROWN_START_Y=200 (air), val=1 → crown at CROWN_END_Y=570 (submerged), handle at top = air, handle at bottom = water — direction is actually CORRECT; but the slider is a custom SVG drag handle (not a native input range) with no keyboard support and requires precise dragging, lowering UX score; physics values are solid (gold 19.32 g/cm³, fake 11.0 g/cm³, same 1000g mass), water rise and displaced volume are computed correctly, and the Heureka animation with sparkles and waving Archimedes figure is a strong finish.
13,293 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (dragging down = deeper into water, but the label at top says "Luft/Air" and bottom says "Wasser/Water" — top value 0% maps to crowns in air and bottom 100% maps to crowns submerged, which is technically correct labeling but the handle starts at the top for 0% meaning air, so direction IS arguably correct; however the SVG drag maps local Y increasing downward so slider bottom = water = deeper, which matches — re-examining: val=0 → crown at CROWN_START_Y=200 (air), val=1 → crown at CROWN_END_Y=570 (submerged), handle at top = air, handle at bottom = water — direction is actually CORRECT; but the slider is a custom SVG drag handle (not a native input range) with no keyboard support and requires precise dragging, lowering UX score; physics values are solid (gold 19.32 g/cm³, fake 11.0 g/cm³, same 1000g mass), water rise and displaced volume are computed correctly, and the Heureka animation with sparkles and waving Archimedes figure is a strong finish.