Will Shortz Presents the Super Book of Serious Sudoku

Blossom into a true sudoku expert!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