Sudoku For 6 Year Olds: 4x4 Sudoku Puzzles Book For Kids, Boys, Girls, Elementary School Good Logic Challenge (Paperback)

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100 Easy 4x4 Sudoku Puzzles for Kids: Mini Sudoku Puzzle for Children / Ages 4-6 / Large Print / Handy Size (Large Print / Paperback)

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Sudoku For Kids Ages 4-8: Challenging And Easy (4X4) Sudoku Puzzles Book For Kids And Beginners With Solutions Gift Idea For Toddlers Preschool a book by K. Maris Press Publishing

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Sudoku for kids : A collection of 150 Sudoku puzzles including 4x4 puzzles, 6x6 puzzles and 9x9 puzzles (Paperback) - Yahoo Shopping