Real Challenge for the Real Sudoku Master with 240 Extreme Sudoku Puzzles to Solve

Challenging Sudoku puzzles are good for the brain. They trigger new connections as you concentrate to see patterns and determine the right answers. You're using logic, memory and creativity every time you solve a Sudoku puzzle. If you want to be a real master at the game, you need to practice a lot. You will also need a book that has 240 extreme Sudoku puzzles. Good luck