Hanayama | Coil Hanayama Metal Brainteaser Puzzle Mensa Rated Level 4

It appears like a box-like lump with a hole in it, but is actually comprised of two coiled up virtually identical pieces. You must try to take it apart by sliding and rotating the pieces. Although the pieces are angular in shape, they can be rotated in unexpected ways, making their movements quite intriguing. Designed by Edi Nagata of Japan. The theme of the puzzle is Coil.