Query: very difficult sudduko
SUDOKU Large Print Puzzle Book for Adults: 200 HARD & VERY DIFFICULT Puzzles
Sudoku 555 Puzzles Easy to Expert: Easy, Medium, Hard, Very Hard, and Expert Level Sudoku Puzzle Book For Adults (Puzzles & Games for Adults)
Sudoku Puzzle Book Extreme Level: Diabolically Difficult Puzzles for Advanced Solvers
The Largest Sudoku Book In The World - 3000 PUZZLES: Medium - Hard - Extreme | 3 Difficulty Levels | 9x9 Puzzle Grids With Answers At The Back
Brain Games - Relax and Solve: Sudoku (Purple)
Hard Sudoku Puzzle Book for Adults: 400 Very Hard Sudokus for Advanced Players
Brain Games - Large Print Sudoku Puzzles (Green)
SUDOKU SUPER FIENDISH: Very Difficult Sudoku Puzzles
SUDOKU Large Print Puzzle Book For Adults: 100 Puzzles - Easy, Medium, Hard and Very Difficult
The Monster Book of Really Hard Sudoku: 500 Puzzles, Large Print
Beyond Black Belt Sudoku: If you have to ask, it's too hard for you. (Martial Arts Puzzles Series)
Will Shortz Presents Perfectly Impossible Sudoku: 200 Very Hard Puzzles
Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles
Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles
Solving Sudoku: Illustrated Strategies
Extra Large Print Sudoku: 100 Very Easy Puzzles (100 Extra Large Print Very Easy Sudoku Puzzles)