Sudoku

Sudoku is a mathematical game that was invented by Switzerland in the 18th century and spread to the United States. It is then played by Japan. is a logic game that uses paper and pens for calculations. Players need to infer all the remaining spaces based on the known numbers on the 9×9 panel, and to satisfy each row, each column, and each bold line the numbers in the palace are 1-9, not repeated.