Plate-and-ring puzzle

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