Magnetic toy blocks

A block toy composed of a plurality of blocks magnetically connectable to each other, wherein at least one of said blocks comprises a hollow block main body having plural flat surface portions, a plural number of magnet holders, corresponding to said plural flat surface portions, arranged on inner sides of said respective flat surface portions and having magnet holding portions extending in parallel with said corresponding flat surface portions, and permanent magnets accommodated within said magnet holding portions of said magnet holders for rotation about imaginary axes extending at right angles relative to said flat surface portions corresponding to said magnet holding portions;

• wherein said plural magnet holders are connected together to form a connected magnet holder;
• said connected magnet holder having a cross-sectional shape substantially similar to a corresponding cross-sectional shape of the hollow block main body formed by said corresponding plural flat surface portions, said connected magnet holder with said permanent magnets accommodated within said magnet holding portions being positioned within an opening defined on said hollow block main body such that said connected magnet holder is immovably maintained in contact with inner walls of said hollow block main body.