The Cast Delta puzzle, part of the Hanayama Cast Puzzle series, was designed by Finnish puzzle designer Kyoo Wong, known for his intricately crafted and cleverly engineered designs. The puzzle's triangular shape was inspired by the Greek letter "Delta," representing change or transformation, which aligns with the puzzle's goal of disassembly and reassembly. The puzzle's difficulty level is rated 3 out of 6 stars in the Huzzle series, scoring 6 out of 10 for complexity. Despite its relatively simple design, the locking mechanism presents a deceptive challenge that requires precision and patience to master.This challenging puzzle requires both careful observation and dexterity.