GrassGames' Sudoku is a simple free Sudoku game that offers four difficulty levels. The goal of the game is to complete a 9x9 grid with numbers from 1 to 9 in a way that no column, row, and 3x3 subgroup has a repeated number. For every difficulty level, you will find ten different games. The puzzles can be printed or you can solve them directly in the application.
The game can be controlled with your mouse or you can use the specified keyboard keys. The puzzles include the undo option and pencil markings, but unfortunately, no hints or any help whatsoever. So, you won't even know if the puzzle is correct or not. From the 'Options' menu, you will be able to customize the game colors. There are ten predefined color sets to choose from or if you prefer, you can customize the colors of almost everything (screen, board, lines, puzzle numbers, placed numbers and notes numbers). The game offers a simple user interface, and it has no sounds or music.
In short, if you are looking for a simple application that will allow you to solve and print Sudoku puzzles with different difficulty levels for free, GrassGames' Sudoku may work for you. But if you are looking for something more elaborate with help options, you should definitely look elsewhere.