A crossword puzzle consists of a puzzle maker and a guessing player. As the name implies, it is a jigsaw maker and an artificial jigsaw puzzle. The puzzle must be clever, and then the guessing person solves the puzzle. In China, it has a long history, spread widely, varied types and endless changes. 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. The riddle with words as the answer is one of Bao Zhao's puzzles in the Southern Song Dynasty: "Two shapes are one, with four branches and eight heads, 48 18, and the flying spring flows upward." Qian Zhenlun's note: "Tick-tac-toe. Press: four, eight, eight, eight, forty. " Qing Zhou Lianggong's Word Touch Volume 5: "Harmony and Zi"-Gong Jing crossword puzzle: add two points to the word, don't guess the word; Beizi owes two points and does not make a guess. "