5934002
9780312382766
Are you tough enough? Take on this collection of 200 devilishly difficult sudoku puzzles! Includes: -200 hard puzzles -Perfect portable size -Big grids for easy solvingShortz, Will is the author of 'Will Shortz Presents Ferocious Sudoku', published 2008 under ISBN 9780312382766 and ISBN 0312382766.
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