Nine interlocking links
cults3d
It's a traditional Chinese educational item or toy. It's said it served for locking criminals. Though it may be exaggerated, it does look complicated to solve. However, solving it just involves a few basic moves which repeat over and over again. Once you get the trick, you may assemble or disassemble the rings from the handle even blindfolded. Before playing the game, the rings should be connected with the board through the sticks on them: https://youtu.be/Ktw81qsetoU The assembled rings, sticks and the board serve as piece 1 of a lock while the handle serves as piece 2. So the game is locking piece 1 with 2 through operation on rings, or dismantling piece 1 from 2. https://youtu.be/Sox3RH-ZtvA
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