✓ 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
ASCII-canvas approach is creative but the water-level rise formula is ad-hoc and not physically grounded, buoyancy force uses water density=1 g/cm³ without explicit statement but is otherwise reasonable; no true fall animation (crowns teleport via slider position), displaced-water volume is not displayed as a live value, and the custom drag-slider lacks a native range input.
ASCII-canvas approach is creative but the water-level rise formula is ad-hoc and not physically grounded, buoyancy force uses water density=1 g/cm³ without explicit statement but is otherwise reasonable; no true fall animation (crowns teleport via slider position), displaced-water volume is not displayed as a live value, and the custom drag-slider lacks a native range input.