In accordance with embodiments of the invention, a modular marble course system with universal connectors among the components which can be mounted upon a vertical surface, has a large number of attachments, and which utilizes a unilateral construction for among the tracks, is disclosed. In combination, the features of present embodiments may permit a user to build a large number of customized and modular marble courses on substantially any vertical surface, and across multiple vertical surfaces in different planes. The system may include a variety of linear and non-linear tracks, including tracks which span around corners, smoothly move from one vertical level to the next, and which can be rotated to move a marble upwards. The system may further include unique trick attachments such as cannons, catapults, rotating attachments which pivot about an axis, and other attachments.