- 150 Hard 16x16 Sudoku Puzzles for Experienced puzzlers: Logic Puzzles incl. Solutions - Perfect as a Christmas Gift
- 150 Extreme Samurai Sudoku Puzzles for True Professionals: Sudoku Book | incl. Solutions | Perfect as a Birthday Present
- 150 Medium 16x16 Sudoku Puzzles for Smart Fellows: Perfect as a Gift for Grandma and Grandpa | Puzzle Book incl. Solutions
- 150 Medium 16x16 Sudoku Puzzles for Smart People: Perfect as a Gift for Adults, Grandparents or Seniors - Puzzle Book with Solutions
- 1000 Extremely Hard Sudoku Puzzles for True Professionals: Logic Puzzles | incl. Solutions | Classic Sudoku | Perfect as a Gift for Grandma and Grandpa






























