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100 Hard 4x4 Sudoku Puzzles for Kids: Mini Sudoku Puzzle for Children / Ages 4-6 / Large Print / Handy Size / Fox Cover: Sharpened Pencil Press: 9781695539778: Amazon.com: Books
Mini Sudoku For Kids (4x4) - My First Sudoku Puzzles - Volume 1: Houdini, Sherlock: 9781515209607: Amazon.com: Books
Mini Sudoku For Kids 6x6 - Easy to Hard - Volume 1 - 145 Puzzles: Snels, Nick: 9781503187955: Amazon.com: Books
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100 Easy 4x4 Sudoku Puzzles for Kids: Mini Sudoku Puzzle for Children / Ages 4-6 / Large Print / Handy Size: Sharpened Pencil Press: 9781071397633: Amazon.com: Books
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Mini Sudoku For Kids: Over 180 Sudoku 4x4 from Easy to Hard (Sudoku KIDS): Mini Sudoku Puzzle Books: 9798672283494: Amazon.com: Books