Robotime Marble Climber is based on great human engineering. This 3D wooden puzzle combines 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 over and over again on this marvelous wooden marble run puzzle. Intricate system of cogs, gears and wheels,full of crazy twists and turns Consists of a tower distributor, spiral slopes, a crane lifer, a wheel lifter, a short slide and small switches Learn principles of Science,Technology, Engineering and Mathematics(STEM) Pre-cut wood sheet Easy to assemble Age +14+