It appears like a box-like lump with a hole in it, but is actually comprised of 2 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. The theme of the puzzle is "Loops
COIL is Level 3 Difficulty (i.e. quite difficult). It comes in a smart presentation box.These do not come with a solution. However if you visit the distributor website at http://www.eureka-puzzle.eu/eureka/index.php?/all-cast-puzzle-solutions.html and enter the complete barcode found on the box your puzzle came in, you will be able to access the solution.
Designed by Edi Nagata of Japan.