Abstract: Exemplary embodiments of a three-dimensional puzzle having C-shaped members are provided. For example, a three-dimensional puzzle can be provided including a first, second and third C-shaped member each having a first end and an opposing second end, and a first bulbous portion provided on the first end and a second bulbous portion provided on the second end of each C-shaped member, the first and second bulbous portions of the third C-shaped member are each configured to be in contact with and secured against the first and second bulbous portions of the first and second C-shaped members such that the first, second and third C-shaped members are held together independently.

Abstract: Connectable planar toy pieces have base shapes of regular or irregular polygons of various side counts. Connectability is achieved by way of an extension hook on each side of each piece, creating slots with bead-shaped protrusions therein. This arrangement allows two pieces to snap together when one piece is connected to another either slot-to-slot or slot-to-edge. Several pieces may be so connected, forming a variety of possible shapes and structures.

Abstract: An intermeshed gear toy, comprising at least eight primary gears, the primary gears spatially interrelated such that they are located at what would be the corners of a virtual cube, the primary gears directly or indirectly connected such that when any one of the primary gears is turned, all of the primary gears turn, and at least six additional gears, at least some of which are located along the faces of the virtual cube, each additional gear intermeshed with one or more of the primary gears, to increase the motion of the device such that all of these additional gears also move when any one primary gear is turned.