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Jigsaw Puzzles

A tiling puzzle that requires the assembly of numerous small interlocking pieces.

A jigsaw puzzle is a tiling puzzle that requires the assembly of numerous small, often oddly-shaped, interlocking pieces. Each piece has a small part of a picture on it; when complete, a jigsaw puzzle produces a complete picture. People solve jigsaw puzzles as a hobby.

Jigsaw puzzles were originally created by painting a picture on a flat, rectangular piece of wood, and then cutting that picture into small pieces with a jigsaw, hence the name. John Spilsbury, a London mapmaker and engraver, is credited with creating the first jigsaw puzzle around 1760.

Most modern jigsaw puzzles are made out of cardboard, since they are easier and cheaper to mass produce. An enlarged photograph or printed reproduction of a painting or other two-dimensional artwork is then glued onto the cardboard before cutting. The pieces are punch-cut with complex metal dies.

Typical images found on jigsaw puzzles include scenes from nature, buildings, and repetitive designs. Castles and mountains are two traditional subjects. However, any kind of picture can be used to make a jigsaw puzzle; some companies offer to turn a personal photograph into a puzzle.

Jigsaw puzzles typically come in 500-piece, 750-piece, and 1,000-piece sizes; currently the biggest commercially available size is 18,000 pieces. The most common layout for a thousand-piece puzzle is 38 pieces wide by 27 pieces, for a total count of 1,026 pieces. The majority of 500-piece puzzles are 27 pieces by 19 pieces.

Children's jigsaw puzzles come in a great variety of sizes, rated by the number of pieces.

A few puzzles are made double-sided, so that they can be solved from either side, which adds a level of complexity, because one can't be certain that the correct sides of the pieces are being viewed.

There are also three-dimensional jigsaw puzzles. Many of these are made of wood and require the puzzle to be solved in a certain order; some pieces will not fit in if others are already in place.

Also common are "puzzle boxes:" simple three dimensional jigsaw puzzles with a small drawer or box in the center for storage.

Puzzle pieces
The method of cutting pieces varies from puzzle line to puzzle line.

Many puzzles are termed "fully interlocking". This means that adjacent pieces are connecting such that if you move one piece horizontally you move all, preserving the connection. Sometimes the connection is tight enough to pick up a solved part holding one piece.

Some fully interlocking puzzles have pieces all of a similar shape, with rounded tabs out on opposite ends, with corresponding blanks cut into the intervening sides to receive the tabs of adjacent pieces. Other fully interlocking puzzles may have tabs and blanks variously arranged on each piece, but they usually have four sides, and the numbers of tabs and blanks thus add up to four.

Some puzzles also have pieces with noninterlocking sides that are usually slightly curved in complex curves. These are actually the easiest puzzles to solve, since fewer other pieces are potential candidates for mating.
However, a solved part is easily disturbed by accidental shock etc.

The uniform-shaped fully interlocking puzzles are the most difficult, because the differences in shapes between pieces can be very subtle.
Occasionally, some puzzles have bizarre cuts to make solving them more interesting.

Most jigsaw puzzles are square, rectangular, or round, and have edge pieces that have one side that's either straight or smoothly curved to create this shape, plus four corner pieces if the puzzle is rectangular. Some jigsaw puzzles have edge pieces that are cut just like all the rest of the interlocking pieces, with no smooth edge, to make them more challenging. Other puzzles are designed so the shape of the whole puzzle forms a figure, such as an animal. The edge pieces may vary more in these cases.

Two puzzles of the same size and series from the same manufacturer usually have exactly the same cut, since the cutting dies are complex and expensive to make and so are used repeatedly from puzzle to puzzle. This enables disparate puzzles to be combined in odd ways. Bigger puzzles commonly are also divided into two or more sections, sometimes rotated against each other, that were cut with the same standard-sized die.

More recently technology such as computer controlled laser and water-jet cutting machines have been used to give a much wider range of interlocking designs in wood and other materials.

Source: Wikipedia

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