Title: Killer Sudoku: The Lethally Addictive Sudoku Variant, Author: Conceptis Puzzles
Title: Paint-doku, Author: Conceptis Puzzles
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Title: Will Shortz Presents the Little Luxe Book of Sudoku, Author: Will Shortz
Title: Will Shortz Presents the Little Orange Book of Harrowing Sudoku: 335 Frighteningly Fierce Puzzles, Author: Will Shortz