PUZZLE Russian patent published in 1999 - IPC

FIELD: entertainment and logical games. SUBSTANCE: device has dismountable housing which is shaped as parallelepiped and contains 26 identical members which are mounted for free movement, shaped as parallelepipeds. Their sides are split into three groups. Housing is designed as two identical U- shaped members, which conjugated surfaces have projections and recesses respectively. Distance between inner parallel surfaces of housing are greater than triple size of corresponding edge of member and is less than sum of double size of corresponding edge of member and one diagonal of corresponding edge of member. Each corner of housing has hole through which corner of one member is seen. EFFECT: increased entertainment for solving logical tasks. 8 cl, 4 dwg