Each puzzle consists of a 9x9 grid containing numbers in various squares. Your task is to fill all the blank squares so that the numbers 1 to 9 appear once in each row, column and irregular shaped box.
Each puzzle consists of a 9x9 grid containing numbers in various squares. Your task is to fill all the blank squares so that the numbers 1 to 9 appear once in each row, column and irregular shaped box.