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Future City Marble Run Mechanical 3D Puzzle Infant and STEM confidence in anFuture City Marble Run Mechanical 3D Puzzle brings hands on engineering to life with a futuristic cityscape filled with winding tracks, gears, tunnels, and speeding marbles. Build the 140 piece wooden model, then activate the marble run with its lift and dynamic lighting to watch marbles travel through the interconnected city. The design combines mechanical movement, architecture, and gravity driven motion into an engaging STEM inspired building