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