Will Shortz Presents Train Your Brain Sudoku: 200 Puzzles to Flex Your Mental Muscles

Will Shortz Presents Steeped in Sudoku: 200 Challenging Puzzles

Will Shortz Presents Double Shot Sudoku: 200 Challenging Puzzles

Will Shortz Presents Genius Sudoku: 200 Extreme Puzzles

Will Shortz Presents Perfectly Impossible Sudoku: 200 Very Hard Puzzles

Will Shortz Presents Insomnia Sudoku: 200 Can't Sleep Puzzles

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

Will Shortz Presents Red Hot Sudoku: 200 Challenging Puzzles

Will Shortz Presents Sudoku While You Wait: 200 Puzzles to Pass the Time

Will Shortz Presents Snow Day Sudoku: 200 Challenging Puzzles

Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles