200 more medium but challenging puzzles Alphadoku - Sudoku with a difference!: Medium difficulty, brain training puzzles to the max in a handy, pocket sized format: Birch, Kevin, Addicts, Puzzle: 9798666042328: Amazon.com: Books
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
NO FRILLS SUDOKU HARD #1: 60 Hard Sudoku Puzzles & Answers in a Handy 5 x 8-inch size: Designs, TT77: 9781689585439: Amazon.com: Books
Jigsaw Sudoku Puzzle Books - 250 Hard Puzzles Volume 3: Handy 6 x 9 inch Book Layout – 2 Puzzles per Page: Demarco, Christian: 9781096274636: Amazon.com: Books
Fun and Easy Sudoku : 100 Sudoku Puzzles with Difficulty Easy :Compact and Handy 6"*9" size: Puzzle Book: Hewkin, Fabio: 9781539925712: Amazon.com: Books
Sudoku Pocket Easy to Hard Levels: 150 Handy Size Travel-Friendly Puzzles and Solutions | Fits into Handbag or Backpack | Problem Solving on the Go | Volume Five: Puzzles, Merlin: 9781671940758: Amazon.com: Books
Sudoku 320 Puzzles With Solutions: 9x9 Sudoku puzzle suitable for all ages | Challenge yourself or simply use as brain training | Difficulty level ... (Sudoku 320 Puzzles With Solutions: Advanced): Bean, Steven: 9798505303481: Amazon.com: Books
Travel Sudoku Book 1: Large Print Handy Puzzle Collection with an Enjoyable Mix of Easy, Medium and Hard Games - Perfect for Vacations (Tropical Island Cover): Freedom Sudoku, Freedom Bell: 9781980931027: Amazon.com: Books
Jigsaw Sudoku-X Puzzle Books - 250 Medium Puzzles Volume 2: Handy 6 x 9 inch Book Layout - Ideal for Beginners: Demarco, Christian: 9781098699383: Amazon.com: Books
Sudoku 120 16x16 medium puzzles: A challenging Sudoku variation brain training in a handy pocket sized paperback book: Addicts, Puzzle: 9798693300354: Amazon.com: Books
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150 Medium Twins Sudoku variation & variants with answers: Taking regular suduko puzzles to the next level - brain training puzzles Vol 1 In large print and handy paperback format: Birch, Kevin,
Sudoku: 1,000 Medium Puzzles: Handy Sudoku Series Book: Handy, Tom: 9781534980822: Amazon.com: Books
200 Sudoku Extreme puzzles with solutions: Arguably tougher than killer sudoku with 2 to a page puzzles in a handy, pocket sized book: Birch, Kevin, Addicts, Puzzle: 9781073723423: Amazon.com: Books
Sudoku 120 16x16 medium puzzles: A challenging Sudoku variation brain training in a handy pocket sized paperback book: Addicts, Puzzle: 9798693300354: Amazon.com: Books