Classic Sudoku game. The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9� grid made up of 3� subgrids (called "regions"), starting with various digits given in some cells (the "givens"); each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. How to play this flash Sudoku: - Select your difficulty level. - A new random sudoku will be generated - Select the number in the left tool bar and use that number to fill a box on the grid -When you've filled in all of the boxes or during the game, click the 'check table' button to see if you have made any mistakes. Enjoy and good luck.