Magnetic block toy, and travel course design drawing

A magnetic toy block comprising a magnetic element for an attracting magnet, wherein the magnetic element is provided on a surface of a block-shaped element having at least one pair of projecting and recessed parts shaped to as to be capable of being joined together and rotating around the joining direction, wherein the block-shaped element is capable of being substantially continuous when a plurality of the block-shaped elements is joined together by the projecting and recessed parts,

• wherein a mating groove facing a joining direction of the block-shaped element is formed in a wall of one of the projecting part and the recessed part, and a mating projection that mates with the mating groove is formed in the other part;
• when joined block-shaped elements are pulled in an unlocking direction in an opposite direction from the joining direction, the mating projection latches onto a front end of the mating groove, thereby preventing disconnection;
• and, when joined block-shaped elements are rotated, the mating projection surmounts a side wall of the mating groove and dislodges therefrom so that the mating projection does not latch onto the front end of the mating groove, thereby enabling disconnection.