Will Shortz Presents Snow Day Sudoku: 200 Challenging Puzzles

Will Shortz Presents Double Shot Sudoku: 200 Challenging Puzzles

Will Shortz Presents Genius Sudoku: 200 Extreme Puzzles

Will Shortz Presents Steeped in Sudoku: 200 Challenging Puzzles

Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles

Will Shortz Presents Black Diamond Sudoku: 200 Extreme 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 Perfectly Impossible Sudoku: 200 Very Hard Puzzles

Will Shortz Presents Lazy Day Sudoku: 300 Easy to Hard Puzzles

Will Shortz Presents Keep Merry and Sudoku On: 300 Easy to Hard Puzzles