Here we have another classic twisty puzzle. The Curvy Copter is a shape modification of the Helicopter Cube. It was designed by Tom vander Zanden in 2010 which is why his signature is on this puzzle. The cuts are angled in order to reveal the otherwise hidden center pieces which also creates the beautifully curved face pattern. The puzzle turns very well, but could benefit from some lube to help minimize catching. Just like the original Helicopter Cube, the Curvy Copter jumbles, enabling combinations to be reached which would otherwise be unattainable due to parity restrictions. This is an excellent option to learn or master how to solve jumbling puzzles!