Sudoku, especially on harder levels of difficulty, can increase solver's concentration, and that's one important asset of an intelligent person. This is the only benefit that I have recognized in the traditional form of Sudoku. Ok, it can be good for developing quick algorithmic thinking if you will assimilate some of the "solve every sudoku" rules, and systematically apply them on your sudoku games; but basicly, it's only good for training concentration powers. I've seen some of really hyperactive kids get paralyzed while solving sudoku, concentrating hardly just on the grid, ignoring their surroundings, and ignoring their desire to exhibit their hyperactive nature physically.
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