The Cast Trinity puzzle, part of the Hanayama Cast Puzzle series, was designed by Kyoo Wong, a well-known designer of mechanical puzzles. Inspired by the shape of a Celtic trinity knot, this puzzle symbolizes unity and interconnectedness, where three distinct parts must be aligned and separated. Its sleek, intertwined design mimics the fluidity and intricacy of Celtic art, making it both visually appealing and mechanically challenging. The Cast Trinity has a difficulty rating of 6 out of 6 in the Huzzle series and is considered one of the hardest puzzles in the collection, scoring 10 out of 10 on the difficulty scale due to its intricate design and complex solution.