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Awesome Sudoku Variety Puzzle Book Volume... by A/T Computers
Sudoku Puzzle of the Week #3 - GeeksforGeeks
Sudoku to the Extreme by Thomasson, C. J.
Sudoku Book 800 Puzzles, 400 Hard and 400 Extra Hard: Sudoku Puzzle Book With Two Levels of Difficulty To Improve Your Game (Sudoku Book Series 2): Book, Sudoku: 9781545058220: Amazon.com: Books
Sudoko Very Easy Vol.1: SUDOKU Very Easy Version Volume 1 book contains 50 very easy Sudoku puzzles: Win, Lisa: 9781974450190: Amazon.com: Books