Cuboro Metro adds new elements that let you tunnel and turn on the same level, providing more "internal" or hidden possibilities - marbles may disappear within the run for longer periods.

A great addition to anyone's Cuboro collection. Cuboro Metro Wooden marble maze supplementary set - the Metro allows new functions, letting marbles turn inside the blocks without dropping down a level -- the "subway" or "metro" concept adds new possibilities!

Cuboro is a unique, Swiss-made wooden marble run that is the best-in-class for marble runs.  High quality, and endless in its combinations, inventor Matthias Etter's Cuboro and Cugolino marble runs truly are "marble runs for a lifetime."What it does: An ingenious building block and marble run toy from Switzerland, Cuboro allows endless combinations and designs.