An educational puzzle in which there are a base member having a plurality of recesses therein, a corresponding number of pegs, each of a different color, and a corresponding number of blocks, each of the same color as one of said pegs. The blocks, when properly assembled, form a continuous layer of the same outline and size as the base member, so as to cover the base member. Preferably, the base member is circular and the pieces have largely arcuate edge walls. In assembly, the child places the pegs in the recesses in the base member and then places over each peg a block of the same color as the peg over which the block is placed, adjusting the angular position of the block until its fits snugly against the contiguous block or blocks.
A three-dimensional jigsaw puzzle includes a three-dimensional core body having a vertical axis and including a plurality of stackable block units formed by cutting the core body along a plurality of transverse cutting planes that are transverse to the vertical axis. Each of the block units has top and bottom surfaces which are opposite to each other in a vertical direction that is parallel to the vertical axis, and includes at least two block members formed by cutting each of the stackable block units along at least one vertical cutting plane that is parallel to and that passes through the vertical axis. A plurality of interlocking members are disposed to interlock removably an adjacent pair of the block units.
A stacking puzzle including a plurality of stackable, game pieces and one or more solid game rods. Each of the game pieces includes an aperture extending obliquely therethrough. When the game pieces are properly stacked and oriented relative to one another, the oblique apertures line up and allow the game rods to be inserted through all the game pieces. However, the game pieces must be stacked in the proper order and must be placed in the proper orientation relative to one another in order for the apertures to align properly. Although there are a multitude of incorrect ways to arrange the game pieces, only one correct arrangement causes the apertures to align and thereby permit the game rod to be inserted through the game pieces. In one embodiment, the faces of the game pieces are made nonparallel to provide an additional degree of freedom and thereby further increase the challenge of the puzzle.
