✓ 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 (writing-mode vertical-lr with direction:rtl maps value=0 to bottom, so dragging down increases progress, but semantically the hint says ↑ hoch / ↓ ins Wasser — the actual mapped behavior depends on browser rendering and is ambiguous/inconsistent); no smooth fall animation (crowns jump/translate linearly with no free-fall feel); otherwise physics, info panel, heureka, splash, and visual design are solid.
Slider direction is inverted (writing-mode vertical-lr with direction:rtl maps value=0 to bottom, so dragging down increases progress, but semantically the hint says ↑ hoch / ↓ ins Wasser — the actual mapped behavior depends on browser rendering and is ambiguous/inconsistent); no smooth fall animation (crowns jump/translate linearly with no free-fall feel); otherwise physics, info panel, heureka, splash, and visual design are solid.