400 Easy Sudoku Puzzles And Solutions (Sudoku Puzzle - GOOD 9781986675819 | eBay
Medium Hard Sudoku - Etsy
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Sudoku Large Print With Tips and Tricks: 100 Medium to Hard Puzzles for Adults & Seniors for Gradually Improving Sudoku Skills, Four Puzzle Per Page (Puzzles & Games with soulutions) (Paperback) -