"Zìmí" is a word game, which is a unique language and cultural phenomenon of Chinese characters. Mainly according to the characteristics of complex strokes, relatively independent radicals and changeable structural combinations of Chinese characters, it is set 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 words and phrases are short, and the diction and rhetoric skills of riddles are also very high.