Extreme Sudoku: 100 Difficult Level 4 Puzzles

Are you Looking for an extra challenge? This book is exactly what you need. Inside is a collection of 100 sudoku level 4 puzzles. Rich has done his best to handcraft the most challenging, extremely hard sudoku puzzles for you. This is for truly . Exercise your best strategies in sudoku battle. These are so hard you might just have to google "how to solve very difficult sudoku puzzles"! Features: Check out the other great puzzles crafted by ! He offers all other sudoku levels from introductory easy to expert hard in his Power Player Games series.