Abstract: An embodiment of the present invention provides a toy roller coaster assembly having magnetically attachable track sections and an integrated audiovisual system. The assembly can include a magnetic lift, a magnetic bridge, and a magnetic U-turn. A controller can control the frequency by which a magnetic lift delivers balls to an uppermost track section and can produce audio and/or visual effects in response to signals from sensors that detect passing balls. Joint members of the assembly can magnetically connect the track sections to each other and to a plurality of vertical supports, to provide a variety of configurations. The controller can generate voice and music samples, sound effects, graphic displays, animation sequences, and video clips in conjunction with the motion of the balls through the circuit of the roller coaster assembly.