Will Shortz Presents The Super Book of Serious Sudoku: 300 Challenging Puzzles

For those who are serious sudoku addicts comes a new collection that is both challenging and convenient to take wherever you go. This volume of 300 devilishly difficult sudoku grids is the perfect recipe for hours of entertainment. Features: - 300 hard sudoku puzzles - Big grids for easy solving - Introduction by puzzlemaster Will Shortz