The puzzles in Sudoku Plus are conceived by Japan’s greatest puzzle mind, Tetsuya Nishio, who takes extreme pleasure in hand-creating his teasers. This new series provides 101 Sudoku puzzles per book, “plus” an extra puzzle type in each volume. The trim size and level of difficulty have all been reduced compared to Vertical’s previous line of Sudoku books, making Sudoku Plus the perfect companion for travelers and commuters.