✓ 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
All prompt requirements are implemented and physically correct, but there is a minor bug where a stale reference to an undeclared `waves` variable is used in the rapid-movement splash branch (line `if (waves.length < 3)`) — harmless in practice but sloppy; the visual and physics fidelity are otherwise excellent.
10,431 output tokens · claude-opus-4-6 · end_turn
All prompt requirements are implemented and physically correct, but there is a minor bug where a stale reference to an undeclared `waves` variable is used in the rapid-movement splash branch (line `if (waves.length < 3)`) — harmless in practice but sloppy; the visual and physics fidelity are otherwise excellent.