The Cast Enigma was designed by Eldon Vaughn, inspired by the concept of infinity and entanglement. Released by Hanayama, it features two intricately intertwined metal loops that must be separated and then reassembled. With a difficulty rating of 6/6 stars and a 10/10 in terms of challenge, this puzzle is regarded as one of the toughest in the Huzzle series. Its smooth finish and deceptively simple appearance hide the complex sequence of maneuvers required to solve it, making it a favorite among experienced puzzlers.