A toy having in combination a hexahedral hollow body whose walls are provided with through-holes of the number beginning with one and ending with six as is in the case of a die, and rods adapted to be inserted into the through-holes, the rods being classified into four kinds in respect of their lengths, the arrangement being such that the rods are adapted to be all received in the through-holes in the walls of the body only when each of the through-holes is associated with a rod of suited length and otherwise an interference will occur between rods inserted through through-holes.