Puzzle pieces Many puzzles are termed “fully interlocking”, which means that adjacent pieces are connected so that they stay attached when one is turned.
Many are made of wood or styrofoam and require the puzzle to be solved in a particular order, as some pieces will not fit if others are already in place.
The name “jigsaw” came to be associated with the puzzle around 1880 when fretsaws became the tool of choice for cutting the shapes.
“Family puzzles” of 100–550 pieces use an assortment of small, medium and large pieces, with each size going in one direction or towards the middle of the puzzle.
Puzzle sizes are typically listed on commercially distributed puzzles but usually include the total number of pieces in the puzzle and do not list the count of edge or interior
Artisan puzzle-makers and companies using technologies for one-off and small print-run puzzles utilize a wide range of subject matter, including optical illusions, unusual
art, and personal photographs.
 Calculating the number of edge pieces Jigsaw puzzlers often want to know in advance how many border pieces they are looking for to verify they have found all of them.
Like 2-D puzzles, the assembled pieces form a single layer, but the final form is three-dimensional.
One type of 3-D jigsaw puzzle is a puzzle globe, often made of plastic.
However, some puzzles have edge, and corner pieces cut like the rest, with no straight sides, making it more challenging to identify them.
Also, because the print and cut patterns are computer-based, missing pieces can easily be remade.
 Wooden jigsaw pieces, cut by hand Jigsaw puzzles soared in popularity during the Great Depression, as they provided a cheap, long-lasting, recyclable form of entertainment.
A jigsaw puzzle is a tiling puzzle that requires the assembly of often oddly shaped interlocking and mosaiced pieces, each of which typically has a portion of a picture; when
assembled, they produce a complete picture.
More sophisticated, but still common, puzzles come in sizes of 1,000, 1,500, 2,000, 3,000, 4,000, 5,000, 6,000, 7,500, 8,000, 9,000, 13,200, 18,000, 24,000, 32,000 and 40,000
 Early puzzles, known as dissections, were produced by mounting maps on sheets of hardwood and cutting along national boundaries, creating a puzzle useful for teaching
This allows a family of different skill levels and hand sizes to work on the puzzle together.
Also common are puzzle boxes, simple three-dimensional puzzles with a small drawer or box in the center for storage.
 The organization chose jigsaw pieces for their logo to represent the “puzzling” nature of autism and the inability to “fit in” due to social differences, and also because
jigsaw pieces were recognizable and otherwise unused.
 Several word-puzzle games use pieces similar to those in jigsaw puzzles.
Jigsaw puzzles geared towards children typically have many fewer pieces and are typically much larger.
A few puzzles are double-sided so they can be solved from either side—adding complexity, as the enthusiast must determine if they are looking at the right side of each piece.
In addition to traditional flat, two-dimensional puzzles, three-dimensional puzzles have entered large-scale production, including spherical puzzles and architectural recreations.
Sometimes the connection is tight enough to pick up a solved part by holding one piece.
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
The most common layout for a thousand-piece puzzle is 38 pieces by 27 pieces, for an actual total of 1,026 pieces.
The precise cuts gave a snug fit, but the cost limited jigsaw puzzle production to large corporations.
Uniformly shaped fully interlocking puzzles, sometimes called “Japanese Style”, are the most difficult because the differences in the pieces’ shapes are most subtle.
 Royal governess Lady Charlotte Finch used such “dissected maps” to teach the children of King George III and Queen Charlotte Cardboard jigsaw puzzles appeared in
the late 1800s, but were slow to replace wooden ones because manufacturers felt that cardboard puzzles would be perceived as low-quality, and because profit margins on wooden jigsaws were larger.
History John Spilsbury is believed to have produced the first jigsaw puzzle around 1760, using a marquetry saw.
However, any picture can be used.
The puzzle die is a flat board, often made from plywood, with slots cut or burned in the same shape as the knives that are used.
In the 18th century, jigsaw puzzles were created by painting a picture on a flat, rectangular piece of wood, then cutting it into small pieces.
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Photo credit: https://www.flickr.com/photos/ingamun/4318007511/’]