No Peeking! | Sudoku Book with Solutions
(9781645215172) | Senor Sudoku, No Peeking!
(9781645215172) | Senor Sudoku, No Peeking!
iUniverse (9780595436224) | Sudoku Puzzles
Paul Mc Namara (9789527278246) | Sudoku Beginner, Easy Puzzles