THREE-DIMENSIONAL LOGIC PUZZLE Russian patent published in 1995 - IPC

FIELD: development of abilities for logic thinking. SUBSTANCE: plaything has base made of two sections interconnected through an axis. The base is provided with guides being rods which surfaces are adapted for interaction with slots made on ribs of polyhedral play members mounted on the base. The members have through holes and labels provided on their sides. The holes are disposed only on adjacent sides. The members are arranged so that they form groups of intersecting play layers. The latter are set into motion through a fork-shaped member mounted in the plaything. EFFECT: higher quality of puzzle. 4 cl, 14 dwg