A jigsaw puzzle is a cut or sawn image on solid paper or on wood, which has to be made into one whole. Jigsaw puzzles are used as an educational tool to train children's powers of observation and dexterity, but also as a pastime or as a board game for adults.
The difficulty of a jigsaw puzzle depends on:
- the number of pieces
- the shape of the pieces
- the nature of the image