The Cast Spiral puzzle was designed by Ken Walker from Rivermore, California, and takes inspiration from the fluid shape and motion of spirals. This puzzle stands out with its ergonomic design that fits comfortably in the hand, coupled with an elegant metallic finish and complex mechanism. Released by Hanayama, it's a level 9 puzzle (5 out of 6 stars in the Huzzle series), known for its challenging interlocking pieces. Although it may appear impossible to solve, success requires both patience and precise manipulation