How to play : Using the Flash game above, you may play a quick game of Sudoku. We offer suduko puzzles of varying difficulty levels, so everyone may enjoy Sudoku. If you're not sure how to play, read on; To begin a free sudoku puzzle, please select your preferred difficulty level above. To place a number in a square, first select the number in the left column, then click the appropriate square. When finished, select the 'check answers' button.