The Hanayama Cast Duet puzzle features what looks like one ring hanging on the grid. On closer inspection you will see it is two rings and the aim is to remove them and then assemble again.
On playing with the puzzle you’ll notice the two rings are attached with a magnetic force.
Once you solve the first challenge you can try further challenges. Try and hang the rings on the four crossing points on the grid, indicated by numbers. The level of difficulty increases in line with the numbers.
This is rated at 5 out of 6 on the Hanayama difficulty rating.