The crossword puzzle is a word game, which is a unique language and cultural phenomenon of the Han nationality. Mainly based on the characteristics of complex strokes, relatively independent radicals and changeable structural combinations, Chinese characters are created in various ways, such as clutch, loss-increasing, pictographic and knowing. There are broad and narrow definitions of crossword puzzles. A word puzzle in a broad sense refers to all word puzzles, such as word puzzles, word puzzles, sentence puzzles and so on. In a narrow sense, a crossword puzzle refers to a riddle of a Chinese character. The latter pays attention to the combination of writing forms and the collocation of radicals, and describes the components of Chinese characters from the perspectives of form, function and meaning. The expression of words is short, and the rhetorical skills of writing words and riddles are also high. This book mainly discusses crossword puzzles in a narrow sense, that is, crossword puzzles.

Crossword puzzles have a long history in China, which are widely spread, varied and endless. It is very popular among literati, and it is also used in political struggle and divination. In modern times, crossword puzzles are more popular as a high-level entertainment. In the form of crossword puzzles, people split and clutch regular Chinese characters in various ways that are not in line with the principles of philology. In this unpredictable physical isolation process, it not only highlights the characteristics of physical knots contained in Chinese characters, but also fully demonstrates people's intuitive understanding of the physical structure of Chinese characters. Studying crossword puzzles can reveal the laws of creation and design contained in crossword puzzles, help to sort out traditional national culture, and reveal the folk interpretation characteristics of orthodox Chinese characters that are outside the orthodox writing theory.

A complete crossword puzzle, besides riddles and answers, there is also a riddle. Riddle is a word belonging to riddle, which plays a certain role in limiting the scope and quantity of riddle. The scope of the riddle is quite wide. Not only crossword puzzles, but also puzzles about things and things. The mystery of things is that the answer is the riddle of concrete things. A riddle is a riddle whose answer is a certain behavior or action. The mystery of things and the mystery of things are very different not only from the scope of puzzles, but also from the design and expression of puzzles. In order to make puzzles clear what answers they want to guess, it is necessary to use riddles in riddles to specify the approximate range of answers. At the end of a riddle, brackets are usually used to explain "typing" or "guessing" so that people can understand that this riddle is used to guess words. In crossword puzzles, another special function of puzzles is to distinguish one-sided puzzles from one-sided puzzles.