Plate-and-ring puzzle
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A plate-and-ring puzzle usually consists of two pieces:
- one plate or similar displaying many holes and/or indentations
- a closed or nearly closed ring or a similar item.
The plate as well as the ring are usually made from metal. The ring has to be disentangled from the plate.
Plate-and-ring puzzles have a long history and are among the first puzzles ever made.
See also: Disentanglement puzzles