Spiral Hanayama Metal Brain teaser consist of five very similar looking, jigsaw-shaped, solid metal pieces. The pieces join together similar to those of a jigsaw puzzle. Alas, but not quite so simply. Small, compact, hand-size, tricky puzzle. The objective is to separate the five pieces and then re-join back together in the shape of a disc. NO FORCE ever needed. Clever puzzle and moderately tricky. Hanayama rates this as a level 5 on a scale of 1 to 6 (where 6 is those most difficult.) Your experience may differ substantially. Ratings are subjective. The dice face on the packaging indicates level of challenge. Most puzzlers do find the SPIRAL to be a very satisfying challenge. Great for fidgety hands. Solid cast metal pieces. This is one of the stronger Hanayama puzzles. Great for ages 14 to 105 years.Reminder: only clever movements. NO FORCE. There are 60 plus different cast metal brainteasers in the Hanayama series. Hanayama is the Japanese manufacturer of these puzzles. Bonus Red Velveteen Drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. Bundled Items. PS. Official Hanayama Puzzles are packaged in the dark green box with see-through front. They also have a "Hanayama" imprint directly engraved into the metal.