Pause for Puzzles: Sudoku for Mindfulness
KNYGA Hugh Jassburn 52 Things to Do While You Poo: The Sudoku Puzzle Book
KNYGA Eric Saunders The Kew Gardens Large Print Book of Sudoku
KNYGA Guardian Killer Sudoku 1, A collection of more than 200 challenging puzzles
KNYGA Roland Hall Ninja Sudoku Challenge, Over 200 puzzles to do anywhere, anytime


