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Test your wits against 210 previously unpublished killer sudoku puzzles from The Guardian's puzzle-setters.
The Guardian's killer sudoku puzzles are enjoyed by hundreds of thousands of people every day. While only a minimal level of mathematical knowledge is needed, all of your logical reasoning will be required to solve these brand-new puzzles. The killer sudoku have been designed to increase in difficulty as the book progresses, so this book can be enjoyed by novice and master alike.