sudoku

i want to make a sudoku..which is a game..can anyone tell me how to start?
i mean i ll have to save the game as well that means i ll be using files so whats the extension for games?
File extensions can be anything you want - you can have the extension .g or .mysudokugamesavefile - it doesn't matter nor does it affect the data within the file.
ok..thank you
Have you done any work on it yet? Are you going graphical? What's your time line?
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