Will Shortz Presents Survival of the Fittest Sudoku: 200 Hard Puzzles in Bloomington, MN

Watch out! These Sudoku puzzles are not for the faint of heart! But if you dare, grab a pen and take on these two hundred all-new extra-challenging puzzles in
Will Shortz Presents Survival of the Fittest Sudoku.
Features:
200 hard puzzles
Big grids for easy solving
Introduction by legendary puzzlemaster Will Shortz