✓ 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 (min=0 at top maps to air, max=100 at bottom maps to water — visually correct BUT the HTML range input rotated -90deg means the thumb at visual top actually corresponds to max value=100/water, so the mapping is backwards); strong overall implementation with bubbles, ripples, splash, Heureka animation, live physics panels, and comparison bars, but the rotated range input creates an inverted UX where dragging the thumb toward the water icon moves crowns into air.
10,581 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0 at top maps to air, max=100 at bottom maps to water — visually correct BUT the HTML range input rotated -90deg means the thumb at visual top actually corresponds to max value=100/water, so the mapping is backwards); strong overall implementation with bubbles, ripples, splash, Heureka animation, live physics panels, and comparison bars, but the rotated range input creates an inverted UX where dragging the thumb toward the water icon moves crowns into air.