A block set includes a smallest size block that has a cubic shape, with one side exceeding 2.5 cm, and a plurality of blocks that have a larger volume than the smallest size block, are circumscribed by a rectangle with a minimum side exceeding 2.5 cm, and have the same height from a bottom surface to a top surface. The smallest size block and the blocks each have a plurality of magnets that are disposed on lateral surfaces with different poles facing outward.