✓ 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
Fully featured ASCII-art implementation hits every requirement; physics values are plausible (Au 19.3, fake 13.0, same 1000 g mass) with iterative displacement convergence, though the "water rise in rows" is a purely visual scaling rather than a rigorously derived unit, and the dual render/tick architecture (dead first render + IIFE override) is messy but functional.
9,478 output tokens · claude-opus-4-6 · end_turn
Fully featured ASCII-art implementation hits every requirement; physics values are plausible (Au 19.3, fake 13.0, same 1000 g mass) with iterative displacement convergence, though the "water rise in rows" is a purely visual scaling rather than a rigorously derived unit, and the dual render/tick architecture (dead first render + IIFE override) is messy but functional.