Puzzle Baron’s Fiendish Logic Puzzles: The Most Devilishly Difficult, Brain-Challenging Fun Yet! Baron, Puzzle
Murdle Puzzle Series Collection 3 Books Set (Murdle, Murdle: More Killer Puzzles & Murdle: Even More Killer Puzzles) G. T. Karber
Sudoku: Over 200 Puzzles & Solutions, Easy to Hard Puzzles for Adults, Spiral-Bound (Brain Busters) Parragon Books