Hard Sudoku

Increase your sudoku skills, one terrific puzzle at a time, till you’re a puzzle master!

Have you mastered beginning-level sudoku and want something just a little harder? These 246 puzzles provide the terrific mental workout you’re looking for. This collection will get you into peak cognitive fitness, as you work your way through increasingly challenging conundrums.  By the time you’re finished, you’ll be a sudoku expert!

Reissue of Easy-to-Hard Mensa Sudoku