Good Old Sudoku is a very simple sudoku game with limited options. The game can be downloaded or played online. It has only one screen from which you can control everything. It includes only one game grid (9x9), but you can select the combo number, and the amount of numbers given by entering them manually. This determines the difficulty of the game. The user interface is very simple, and not customizable at all. It has sound effects and music, which can be turned off/on with the buttons at the upper right corner of the screen. From there, you can also select to play in full screen mode. The game includes undo and redo options, but no hints, markers, highlighter, or anything of the sort. It doesn't include a puzzle creator, either, to create your own games or check those of newspapers or magazines. It comes with clear instructions that can help you if you are a beginner.
As you can see, the game offers limited possibilities and it won't be long until you get bored. However, it is free and can be used to kill some time.
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