Totally Awesome Mazes and Puzzles: Over 200 Brain-bending Challenges Becky Wilson, Parragon Books, William Potter
Big Book of Sudoku: Over 500 Puzzles & Solutions, Easy to Hard Puzzles for Adults (Brain Busters) Parragon Books
Sudoku: Over 200 Puzzles & Solutions, Easy to Hard Puzzles for Adults, Spiral-Bound (Brain Busters) Parragon Books