I'll create a 3D two-layer Go game for you! This will be a fascinating twist on traditional Go with stones placeable on two stacked 11x11 boards.

I've created a fully functional 3D two-layer Go game! The game features two 11×11 boards stacked vertically where stones can be placed on both layers and interact across dimensions. Players can rotate the 3D view, click intersections to place stones, and the game enforces standard Go rules including captures and liberties that work across both layers. The interface includes move tracking, undo functionality, and captured stone counts.

Perfect! I've implemented all three requested improvements: the menu is now collapsible with a toggle button for mobile users, the clickable intersection areas are significantly larger (increased from 0.1 to 0.25 radius), and I've added vertical connecting lines between corresponding intersections on both layers. The menu also has improved transparency for better visibility when open.