The standard version of Sudoku consists of a 9 × 9 square grid that contains 81 cells. The goal is to complete the entire grid using the nine digits so that each row, each column and each block contains each number exactly once. The same integer cannot appear twice in the same row, column or one of the nine 3 × 3 sub-regions of the 9 × 9 game board. A Sudoku Puzzle- can have more than one solution.