Freeware Sudoku generator has 3 levels of difficulties. You may print created Sudoku grid or play on computer screen. No installation is required, simply download Sudoku.exe file and play. Solved or not solved Sudoku may be saved into file with extension sdk. Later saved files may be loaded in 9x9 Sudoku grid.
The software has hint option to provide step by step solution to complete a Sudoku puzzle. Also you may save generated Sudoku as PDF file or HTML file and use it later on your web site (for more details click here).