The term “Jigsaw” comes from puzzles being cut from wood by a Jigsaw tool
The first Jigsaw Puzzle was created in 1767 by cartographer James Spilsbury who cut up a wood map with each country being its own piece to help teach geography.
Jigsaw puzzles can be more difficult for a lot of reasons. When the first puzzles were invented, there was no picture to work from — so often people were guessing at where shapes would go just from the title on the box. Do you think you could put a puzzle together if the title just said "building" or "tree"?