As the name suggests, this awesome gear puzzle was created by Russian puzzle designer Timur Evbatyrov in 2012. A year later, Calvin’s Puzzle mass-produced it. Surprisingly, the puzzle solves similarly to a normal Rubik’s Cube except the gear pieces have a specific orientation which adds to the challenge. Turning the gears can be a bit stiff but it gets smoother the more you use it. The puzzle comes with a turning nob, but we found it easier to turn by hand–just don’t pinch your fingers! Overall, this is a very unique and beautiful looking puzzle.