Will Shortz Presents Double Shot Sudoku: 200 Challenging Puzzles

Will Shortz Presents Genius Sudoku: 200 Extreme Puzzles

Will Shortz Presents Sweater Weather Sudoku: 200 Challenging Puzzles: Hard Sudoku Volume 2

Will Shortz Presents Extra Hot Sudoku: 200 Hard Puzzles: Hard Sudoku Volume 1

Will Shortz Presents Steeped in Sudoku: 200 Challenging Puzzles

Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles

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

Will Shortz Presents Snow Day Sudoku: 200 Challenging Puzzles

Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles

Will Shortz Presents Mind-Melting Sudoku: 200 Cranium-Crushing Puzzles

Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles