Will Shortz Presents Survival of the Fittest Sudoku: 200 Hard Puzzles

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.

Features:
200 hard puzzles
Big grids for easy solving
Introduction by legendary puzzlemaster Will Shortz

• Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles
• Will Shortz Presents Mind-Melting Sudoku: 200 Cranium-Crushing Puzzles
• Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles
• Will Shortz Presents Hard Sudoku Volume 2: 200 Challenging Puzzles
• Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles
• Will Shortz Presents Sweater Weather Sudoku: 200 Challenging Puzzles: Hard Sudoku Volume 2
• Will Shortz Presents Ferocious Sudoku
• Will Shortz Presents Extra Hot Sudoku: 200 Hard Puzzles: Hard Sudoku Volume 1
• Sudoku: Medium - Hard: 200 advanced sudoku puzzles
• Will Shortz Presents Hard Sudoku Volume 4: 200 Challenging Puzzles