3D Marble Run Music Box Game Builder

One prompt that builds a complete 3D marble-run puzzle game in a single HTML file with three.js, with a musical twist: every solved board plays a tune. Place curves, funnels, splitters, lifts and see-saws inside a wooden music box, press Play and the marbles ring the chimes in order. 24 levels in 4 drawers, a finale that plays your own melody, a free Composer with shareable codes and a daily puzzle. Includes 20 bonus ready-to-use idea sets. Try the live demo.