The next instalment in the popular Jumbo Sudoku series, Jumbo Sudoku Brain Bender includes over 300 puzzles. The popular numerical brainteaser is a fun way to work your brain, and sudoku fans of all levels will love this collection. Jumbo Sudoku Brain Bender includes classic sudoku as well as - Samurai, Kakuro, Killer, Battleship and Son of Sudoku Futoshiki puzzles. All the puzzles are rated on a scale of tricky to fiendish. If you are looking to finally be challenged by sudoku, this is the book you have been waiting for.