The middle one moves half to the left or right. The middle one is moved to the left or right by half, and the extra one on the top is put down, which is exactly the inverted fork pattern, so that the sugar is outside. Playing puzzle games can improve the skills of using numbers, deductive reasoning, critical thinking and social skills. Even the sudoku game played by one person can reduce people's risk of cognitive impairment, and crossword puzzles can reduce this risk by 47%.