Expert Sudoku (Nikoli Publishing)(Paperback) - diskuze

The Sudoku craze continues! And now, players are ready for a real challenge. Ready to take it up a notch? This title features over 300 challenging puzzles created by hand by Nikoli, the Japanese company that originated Sudoku. It is a step up from beginner puzzles, but not quite as tough as those in "X-Treme Sudoku".
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