Sudoku is a digital puzzle game. Players need to use rules and reasoning based on known numbers on the board, filling in numbers in other spaces so that each number can appear only once in each row, column, and house. The game also has a difficulty of 6X6, 9X9, 12X12, and players can freely choose the difficulty to play. The game comprehensively tests the ability of the subject to observe and reason. Although the gameplay is simple, the number arrangement is ever-changing. How to play is not too greasy, let us play Sudoku together!