A hollow version of the three-dimensional puzzle “Pyraminx” that matches the colors of the four sides of a regular tetrahedron.With a skeleton specification that allows you to see the mechanism inside, the futuristic look looks great in the interior.Equilateral triangle.A three-dimensional puzzle in which each face is divided into nine equilateral triangles.It will be completed if each side can be aligned in one color.There are 75 million combinations.The difficulty level is relatively easier than the hexahedron, so you can work on it as an introduction to cube puzzles.It is a puzzle that requires observing power because the ticking movement when rotating the surface is comfortable, and the figure is rotated to think about the next position and the position beyond it.