  
Hooked on sudoku? If the puzzles in the daily paper and on the Web are no match for your practiced powers of deduction - Welcome to Extreme Sudoku!
Here are 101 chances for you to put your talents to the test. Designed by a sudoku master for highly advanced enthusiasts, these 9 x 9 square and 16 x 16 square puzzles will challenge even the most skilled experts. Solutions appear at the end of the book (just in case).
144 paperbound pages.
Price: $5.95
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