To solve a Sudoku enter the given numbers and click Solve. The solution will appear immediately. The given numbers remain in red color, while the computed ones will be shown in blue color. To create a Sudoku click Create. For a more difficult Sudoku uncheck Simple. To save a sheet click save and enter the desired name. The sheet will be saved in form a HTML file, which can be opened with any browser. Use the browser's printing option to print it.