Abstract: A multidimensional front-and-back-sides-freely-buildable building block toy construction set includes a first module and a second module. The first module is provided with a single, a single column of, two columns of or multiple columns of first coupling short posts on a front side, and is provided with a concave surface on a back side. Multiple columns of protruding second coupling short posts are disposed on the concave surface. The second coupling short posts are distributed as follows: columns: uniformly distributed in the same columns as the first coupling short posts on the front side, and in the middle equally dividing two adjacent columns; rows: in the same columns as the first coupling short posts on the front side, each of the second coupling short posts is alternately arranged with the first coupling short posts, and is located in the middle equally dividing two first coupling short posts.

Abstract: A multidimensional front-and-back-sides-freely-buildable building block toy construction set includes a first module and a second module. The first module is provided with a single, a single column of, two columns of or multiple columns of first coupling short posts on a front side, and is provided with a concave surface on a back side. Multiple columns of protruding second coupling short posts are disposed on the concave surface. The second coupling short posts are distributed as follows: columns: uniformly distributed in the same columns as the first coupling short posts on the front side, and in the middle equally dividing two adjacent columns; rows: in the same columns as the first coupling short posts on the front side, each of the second coupling short posts is alternately arranged with the first coupling short posts, and is located in the middle equally dividing two first coupling short posts.