Cast Devil is one of the most simplistic puzzles in the Hanayama collection. It consists of two identical curvy metal pieces, which are attached to each other. There aren't any secret mechanisms, intricate parts or any other confusing elements. Because of this it doesn't take much time to figure out how to solve it and the suggested 4 out of 6 difficulty seems vastly overestimated. Also, putting the pieces back together doesn't require any thought and can be done in a second. Still, playing with Cast Devil feels entertaining and strangely addicting. Due to its simple design and elegant solution, I highly recommend this little devil for your collection.