An improved traction wheel structure for a motorized toy vehicle adapted to travel along tracks, rails, wires, strings or the like having vertical top edges or diameters, the wheels being provided with a V-shaped annular traction channel defined by laterally extending traction members extending from the sides of a primary annular channel.

One aspect relates to a technology in which one or more external devices are interlocked with scenario-based content executed on a main device. One embodiment includes a system for interlocking content and an external device. The system includes a main device configured to store and execute content and at least one external device connected to the main device by communication. The content may include a control signal for controlling the external device. When the content is executed on the main device, the main device may transmit the control signal included in the content to the external device and the external device may perform a specific function in accordance with the control signal.

A coupling element for releasably connecting two building elements. The coupling element includes two couplers. The first coupler has a mid-flange having a first side and a second side. The first side of the mid-flange includes a coupling portion extending therefrom. The second side of the mid-flange includes at least one protrusion and at least one opening. The second coupler is similar to the first coupler except that it may have a different coupling portion. The protrusions and openings are shaped so that when the two couplers are pressed together, the openings and protrusions form an interference fit to form the coupling element. The coupling element may include a decorative element that is captured between the two couplers when the couplers are pressed together to form the coupling element.