Title: mental_floss Sudoku: It's the Brain Candy You've Been Craving!, Author: Frank Longo

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Title: Absolutely Nasty® Sudoku Level 4, Author: Frank Longo
Title: Poolside Sudoku, Author: Frank Longo

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Title: Absolutely Nasty® Sudoku Level 3, Author: Frank Longo
Title: Absolutely Nasty® Sudoku Level 2, Author: Frank Longo
Title: Cuckoo Sudoku: Sudoku Variants That Will Drive You Batty, Author: Djape
by Djape

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Title: Absolutely Nasty® Sudoku Level 1, Author: Frank Longo
Title: Will Shortz Presents The Little Black Book of Sudoku: 400 Puzzles, Author: Will Shortz
Title: Will Shortz Presents The Little Luxe Book of Sudoku: 335 Easy to Hard Puzzles, Author: Will Shortz
Title: Will Shortz Presents The Little Orange Book of Harrowing Sudoku: 335 Frighteningly Fierce Puzzles, Author: Will Shortz