No Surrender!   Sudoku Hard Puzzle Books
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No Surrender! Sudoku Hard Puzzle Books

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There should be no retreat, no surrender when you're dealing with difficult Sudoku puzzles. You need to develop the thinking "you got yourself in a mess so you need to get yourself out, too." Sudoku trains you to have creative and analytic thinking skills. It also boosts your re-focus abilities. Start solving Sudoku today.