Microsoft Sudoku is a well-known puzzle game. Fill in the puzzle's nine rows and nine columns with the numbers 1-9 using simple logic. In a given row or column, a number can only be used once. To win, you must correctly enter a number in each grid square. There are two ways to play Sudoku: Pen and Pencil. Multiple guesses per square are allowed. To see a list of possible answers highlighted in red, go to the main menu and select the "hint" button. To check for errors, you can also click on the progress button.
Left-click on a square and drag the cursor up and down to select "pen." Type the number. If you're unsure, click pencil. Click a square's number(s).