The object of Cast Duet: swivel the two half rings (in the picture it looks like 1 ring, but it's actually 2 half rings) to various parts of the grid.
This double maze was invented by Oskar van Deventer about 10 years ago. At that time, it was called Matchmaker and it was made exclusively by Tom Lensch, master woodcraftsman. Tom Lensch's version is made of wood and is much larger. It's a gem.
Fortunately, Hanayama has created this smaller, more affordable version.
Click here for the solution.
One of my Hanayama's favorites :D
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