FIELD: games. SUBSTANCE: geometrical concept development game is made up of a box detachable in the plane perpendicular to its lateral wall; and a central vertical axle allowing the rotation in the relation to each another of two parts of the box for a predetermined step. The lateral wall is provided with shaped holes of predetermined form disposed on the wall surface separated by the same step. The holes are open on the side facing the box detachment plane. The hole form is changeable as the box parts rotate in the relation to each another. The game is provided with a set of sectional chips. The number of chips exceeds the number of holes. EFFECT: increased entertaining capabilities; simplified manufacturing technology. 2 cl, 4 dwg
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