✓ 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/top=air is correct conceptually but the hint says "ziehen zum Eintauchen" pointing up, which is non-standard; more critically, no smooth fall animation exists — crown teleports based on slider value with no autonomous falling motion, and splash is cosmetic ASCII-only with no true particle system.
Slider direction is inverted (min=0/top=air is correct conceptually but the hint says "ziehen zum Eintauchen" pointing up, which is non-standard; more critically, no smooth fall animation exists — crown teleports based on slider value with no autonomous falling motion, and splash is cosmetic ASCII-only with no true particle system.