Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles

Watch out! These puzzles are for the most extreme solvers! 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 Genius Sudoku: 200 Extreme Puzzles
• Will Shortz Presents Mind-Melting Sudoku: 200 Cranium-Crushing Puzzles
• Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles
• Will Shortz Presents Terrifying Sudoku
• Will Shortz Presents Extra Hot Sudoku: 200 Hard Puzzles: Hard Sudoku Volume 1
• Will Shortz Presents Perfectly Impossible Sudoku: 200 Very Hard Puzzles
• Will Shortz Presents Survival of the Fittest Sudoku: 200 Hard Puzzles
• Will Shortz Presents Hard Sudoku Volume 2: 200 Challenging Puzzles
• Will Shortz Presents Sweater Weather Sudoku: 200 Challenging Puzzles: Hard Sudoku Volume 2
• Will Shortz Presents Hot Sudoku