Sudoku is a fun way to improve and development. It promotes logical thinking and deductive reasoning skills, decision making, a connection between action and re

★Sudoku Puzzle Books★ This is one of best hard sudoku puzzle books. So, that sudoku puzzle books for adults. In this book has 100 sudoku puzzle. Some of puz

Carefully designed for advanced Sudoku solvers. Includes printed candidate numbers. Writing in candidate numbers for each unknown square is an important step wh

Enjoy the most popular puzzle game in the world! whether you want to keep your brain young and active, develop logical thinking or just keep yourself busy to av

Sudoku Hard to Extreme: 100 pages of sudoku puzzle for adult with solutions included. Full features include: 8.5 x 11 page paperback format 100 mazes with corre