Polyhedral toy

A polyhedral toy, comprising eight polyhedral pieces,

• wherein the polyhedral pieces are each formed with, among six faces of a cube, three faces adjacent to one another being left remaining and another three faces being removed, to thereby form three quadrangular pyramids having the remaining three faces serving as bottom faces, and the polyhedral pieces each include a triangle surface formed of six faces other than respective side faces of the quadrangular pyramids placed on one another,
• wherein, when the bottom faces include a first face and a second face, which perpendicularly intersect each other in a vertical direction in plan view on the triangle surfaces, and a third face, which perpendicularly intersects each of the first face and the second face in a horizontal direction, the polyhedral pieces are arranged so that, in plan view on a top face of the polyhedral toy having been unfolded into a cuboid shape of two rows and four columns, in each of the first row and the second row, the triangle surface, the third face, the third face, and the triangle surface of the polyhedral pieces are arranged in the following order, and
• wherein, the polyhedral pieces are coupled so that:
• a polyhedral piece located at a first row and first column position and a polyhedral piece located at a first row and second column position are coupled to each other at respective sides of first faces which are adjacent to each other;
• the polyhedral piece located at the first row and second column position and a polyhedral piece located at a first row and third column position are coupled to each other at respective sides of a second face and a first face, which are arranged on the triangle surfaces on the respective bottom faces and face each other;
• the polyhedral piece located at the first row and third column position and a polyhedral piece located at a first row and fourth column position are coupled to each other at respective sides of second faces which are adjacent to each other;
• a polyhedral piece located at a second row and first column position and a polyhedral piece located at a second row and second column position are coupled to each other at respective sides of second faces which are adjacent to each other;
• the polyhedral piece located at the second row and second column position and a polyhedral piece located at a second row and third column position are coupled to each other at respective sides of a first face and a second face, which are arranged on the triangle surfaces on the respective bottom faces and face each other;
• the polyhedral piece located at the second row and third column position and a polyhedral piece located at a second row and fourth column position are coupled to each other at respective sides of first surfaces which are adjacent to each other;
• the polyhedral piece located at the first row and first column position and the polyhedral piece located at the second row and first column position are coupled to each other at respective sides of the third faces which are adjacent to each other;
• and
• the polyhedral piece located at the first row and fourth column position and the polyhedral piece located at the second row and fourth column position are coupled to each other at respective sides of the third faces which are adjacent to each other.