Sudoku ( sudoku), sometimes spelled Su Doku, is a placement puzzle, also known as Number Place in the United States. The aim of the puzzle is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids (called "regions"), starting with various numbers given in some cells (the "givens"). Each row, column and region must contain only one instance of each number

Remember the one rule all Sudoku puzzles have to follow. Every row, every column and every region has one, and only one, of the numbers from one to nine