A sudoku puzzle is a logic puzzle which issolved using logic and reasoning. Though the number of squares inthe grid may vary, a standard Sudoku puzzle is a 9x9 grid dividedinto nine 3x3 blocks in which some of the numbers are given. Theobject of the puzzle is to fill in the rest of the grid using onlythe numbers 1 through 9 so that no number repeats in any block, rowor column. The difficulty is determined by how many and whichnumbers are given and where they are placed in the grid and canrange from very easy to extremely challenging.