About Jigsaw Puzzles(3)

Classification of jigsaw puzzles

• Plane puzzle

According to the specifications and dimensions, there are generally 300 pieces, 500 pieces, 750 pieces and 1000 pieces of jigsaw puzzles in the world. Of course, this is only the number marked by the seller for convenience. In fact, the number of parts of the thousand pieces of jigsaw puzzles is 38x27, a total of 1026 pieces; The number of parts of the 500 pieces of jigsaw puzzle is 27x19, with a total of 513 pieces.

According to the single and double patterns, in addition to the common puzzle with patterns on one side, there is also a double-sided puzzle with patterns printed on both sides of the zero piece. You can choose to start the game from any side during the puzzle. If you think that the double-sided puzzle is only 1+1=2; That's a big mistake, because it's difficult to determine which side is the right one in the game. The two-sided puzzle not only changes 1 to 2, but also increases the difficulty and fun of the game.

• Stereoscopic puzzle

After more than 200 years of development, different kinds of three-dimensional puzzles have emerged. The parts of the three-dimensional puzzle are mostly made of hard materials such as wood or plastic. The puzzle of three-dimensional space increases the difficulty of the game. In addition to finding the correct position of each piece, players should also splice it in the correct order. Otherwise, even if the position is correct, they will not be able to splice the remaining pieces. The common three-dimensional puzzle is the puzzle box, which will present a cube shape after all parts are assembled.

Another common three-dimensional puzzle is the spherical puzzle. The special feature of the spherical puzzle is that it is not only a single-layer structure made of cardboard pieces, but also a three-dimensional shape with the attributes of length, width and height. The patterns of spherical puzzles are mostly astronomical models such as globes and lunar instruments.

About puzzle pieces

The edge styles of jigsaw puzzles are also diverse. The most common one on the market is a zero piece edge style called "fully interlocking", which is composed of common protrusions and depressions.

The edge of "comprehensive interlocking" connects the surrounding parts together. When one piece is moved, other parts will also move at the same time and will not be scattered, which makes the puzzle not easy to be shaken and scattered. The puzzle with good splicing will not be scattered when the whole finished product is picked up.

In common jigsaw puzzles, the shapes of all parts are exactly the same. Each part has an axisymmetric "convex" and "concave", and is in the shape of "twenty" as a whole. The parts are neatly arranged in a crisscross manner. Some jigsaw pieces have different structures, but the main body of the pieces is usually quadrilateral, with a "convex" or "concave" on each of the four sides.

It is generally believed that interlocking jigsaw pieces with the same shape are the most difficult to spell, especially those with soft colors and small pattern contrast, because there are often only very subtle differences between pieces, such as Van Gogh's starry sky.

Rectangular puzzles are the most common. In such puzzles, there are always some pieces that lack "concave and convex" on one side or have a right angle. Therefore, when assembling, we often start from the edges and corners. However, there are also some jigsaw puzzles that deliberately make the parts at the edges and corners look like "concave and convex" to make the game more challenging.

There are also some creative puzzles, which make the outline of the puzzles into small animals or other lovely shapes. Although the outline of such puzzles looks more irregular, and there are many more pieces on the edge than the square puzzles, it is relatively easy to put them together in practice. Of course, such puzzles are more suitable for young players.

Non interlocking jigsaw puzzles generally divide the whole picture into scattered pieces by various forms of intersecting curves, and the edges of the pieces are just a section of the curve. This pattern of jigsaw puzzles is relatively simple, because the matching between the pieces is generally fixed, and it is easy to find the adjacent pieces according to the curve shape of the edges. However, when assembling this kind of puzzle, the player is required to be calm, otherwise it is easy to mess up the assembled parts.

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