PLAMA Marble Run 2D is a magnetic marble game for both children and adults designed by Swiss firm Bernhard | Burkhard. The entire set consists of 12 magnetic planes that can be rearranged on a vertical surface resulting in a subtle groove that can be traversed by a marble. Via their web site:
There are thousand ways to create an individual path for the marble that can be reorganised shortly. [...] Plama may help to develop creativity and logical thinking. It can increase the understanding of two dimensional space and proportion. Using the outline of the shapes to build a well-functioning marble run is an easy way to focus on complex thinking. Marble run 2d has been produced in Switzerland in a first limited edition and is available in selected stores or on request.