 Although it has been established that approximately 5.96 x 1126 final grids exist, a brute force algorithm can be a practical method to solve Sudoku puzzles.A brute force algorithm visits the empty cells in some order, filling in digits sequentially, or backtracking when the number is found to be not valid.Briefly, a program would solve a puzzle by placing the digit "1" in the first cell and checking if it is allowed to be there.