Sudoku at extreme difficulty! This is without a doubt, our most difficult sudoku puzzle book to date . Genius level intellect is required to be able to complete this puzzle book . Only those with the sharpest arithmetic skills and mental agility will be able to conquer these extreme puzzles. 50 puzzles included , One puzzle per page in large print makes these puzzles super easy to read but almost impossible to solve ! Do you have the genius level IQ required to solve these EXTREME sudoku puzzles