ROKR Marble Run Race is based on great human engineering. They combine the beauty of science and machines, involving so many small gadgets. Build the set and crank the handle, watch marbles run crazy down the slopes and twisting turns.
ROLLER COASTER DESIGN – This Waterwheel Coaster 3D puzzle is like a real roller coaster, after the assembly, the ball can be rolled along the track. These designs are inspired by real-life mechanisms.