A jigsaw puzzle is one that has multiple pieces in the form of small tiles that have to be put together in a certain pattern in order to make a bigger picture out of them. The pieces are designed in such a way that they interlock with each other, and that certain pieces only interlock with the right other pieces, which helps in constructing the final mosaic.
The pieces are generally made of cardboard but can also be made from other materials such as plastic and wood. Originally, jigsaw puzzles were made by taking the final product in a rectangular form and then cutting it accordingly, with interlocking extensions on each piece. Then, the pieces were separated and hence, the puzzle was ready to be put together.
Jigsaw puzzles are often extremely engrossing and take a long time to solve. They are a great activity to do with more people and can be really fun.
Currently, the only major producer of small-scale jigsaw puzzles related to cubing is QiYi.