Separate the ring from the star and return it to its original position! Hanayama Cast Puzzles are well-crafted metal puzzles that stand out not only for their exceptional quality but also for their extraordinary and high-quality design. The name "Cast Puzzle" comes from the English term to cast, which means to mold metal.

The grooves engraved into the two rotating discs are called "logarithmic spirals." These two grooves always intersect at right angles, and at their intersection, a square hole is formed. The goal of this puzzle is to remove the spiral ring that passes through this hole. The inspiration for this puzzle is the morning glory. The puzzle is designed to resemble a bud that blooms with entwined vines. The original concept dates back to 1990, but it has been expanded with some tricky elements. The theme of this puzzle is "Flower.".