Review on RoWood Wooden Marble Puzzle Building Puzzles in 3-D Puzzles by David Underberg

You want to solve a cool problem that seems to serve a purpose and is educational. Update I'm quite disappointed because I tried to put this level on the table and floor and balance it but when the ball bearings roll into the wheel gears and the top of the bucket it doesn't roll down the chute and stays outside the chute after leaving the wheel lever bearing and on the outside curves opposite the twist grip. Also, the twist grip doesn't stay in place even when the top attaches it to the wheel, and the tees hook into the bearings and stack on top of each other on the way down. The wood is brittle, splits easily, and doesn't stick well along the groove that connects it to the gears. . Also, the overall idea is great and fun to build. And if you can align the gears, everything spins surprisingly well. Fun to watch the beads stack and roll down with clicking sounds.