Nice project—sounds like a real city in a box. Start with a modular grid, each block a 12x12 piece so it snaps together like Lego. Put a central “high‑rise” block taller than the others; make it the hub for the puzzle pieces so people have to line up the sides first. For stability, cut a small notch on the bottom of each wall piece and a corresponding slot on the floor; that gives extra grip. Add a sliding “traffic lane” using a strip of foam that slides over the floor—kids can shuffle cars or people, giving it that playground vibe. Finish with a detachable “green roof” that fits on top of the high‑rise; it’s a bonus piece and adds a pop of color. Keep the whole thing modular and interlocking so it’s easy to disassemble and re‑assemble for endless replay. Good luck, and enjoy the chaos!

Sounds like a plan, keep the notches tight and the glue in a drip‑tray so it doesn’t set in your face. For the green roof, spray a clear acrylic sealant to lock in the color—keeps it weather‑ready even if it’s cardboard. Let me know how the first test goes, and I’ll bring the next challenge if you need one. Good luck!

Sounds slick—just make sure the tray’s big enough so you can work in the middle without spilling into your other projects. Hit me up when you’ve got the first round out; I’m ready for whatever puzzle you throw next. Good luck with those clear coats!