The invention relates to a method for producing a shapable core (10) from a rigid panel (12), the plane of the panel being defined by the axes X and Y and the height H being oriented in the direction Z of an orthonormal reference frame, for producing composite material products, consisting in cutting the panel (12) to form core elements (16). According to the invention, the method consists in making the cuts (14, 34) along the axis Z, producing hooking means (17) on each of the core elements (16) cut in this way, so as to allow the core elements (16) to be connected to each other and to produce a hinge connection (22) with retention between the core elements (16) in the plane XY.

A puzzle set with a plurality of puzzle pieces is provided. Each puzzle piece has at least four puzzle piece sections. The puzzle piece sections comprise a shape that is square, hexagonal, octagonal, circular or any geometric shape. Also, the plurality of the puzzle pieces comprises different geometric shapes such as I-shaped, T-shaped, L-shaped, O-shaped, S-shaped, J-shaped, and Z-shaped. The plurality of the puzzle pieces are arranged against, connected to each other, or stack on each other to shape the pattern of the puzzle pattern and complete the puzzle.