Sudoku Book for Adults and Seniors with 3 Levels of Difficulty: 402 Puzzles & Solutions, Easy to Hard (The Perfect Gift for Puzzle Lovers) (Gifts for Men & Women) Publishing, Rody
101 Easy Logic Grid Puzzles for Absolute Beginners: The Ultimate Adults Brain Boosting Puzzle Book – Learn To Solve Deduction Cross-Reference Puzzles With Detailed Explanations Feline Puzzles, Press
Logic Grid Puzzles: Murder Mystery Puzzle Book for Adults, Armchair Detectives, and Fans of Crime Fiction, Whodunits, and Cozy Mysteries Ben, Thistle