This is the three-dimensional spherical labyrinth that challenges the limits of your manual dexterity and spatial understanding as you maneuver a marble through its entire course. The Superplexus is a complex network of chicanes, multi-planar hairpin turns, spirals, and staircases.
Perplexus (as it called now) was co-invented by teacher and sculptor Michael McGinnis and toy inventors Brian Clemens and Dan Klitsner of San Francisco-based KID Group -known for the invention of the games Bop It, HyperDash, and other titles. McGinnis first sketched ideas for three-dimensional labyrinths in the late 1970s but it was several years before showing the sketches and rough prototypes to Dan and Brian in 1999.
After a year of collaboration and many prototypes later, they perfected the play so that it was easy enough for a young child to start, yet challenging for any age due to its many levels. A version with an electronic timer named SuPerplexus was launched in 2001, but with limited availability.
What's it worth? Take a look at this Superplexus price guide: sold listings for a value indication.