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Title: White Belt Sudoku, Author: Michael Rios
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
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Title: Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles, Author: Will Shortz
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Title: Will Shortz Presents Ferocious Sudoku: 200 Hard Puzzles, Author: Will Shortz
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Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
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