The RotoCrystal puzzle is a shape modification of my Fracture-12 puzzle. I found the RotoCrystal shape to be aesthetically pleasing since the visible core parts are more in proportion to the rest of the puzzle. RotoCrystal shape shifts and jumbles.
The RotoCrystal puzzle comes as a DIY kit of parts, and you will need to supply your own stickers. The templates for the stickers are available in the instructions forum.
I recommend that you purchase the puzzle in "Black Strong & Flexible". It costs a bit more than the white material, but it's worth it since the finished puzzle will look and work better. All of the parts snap together, so no additional screws, springs, or other hardware are required.