Very Hard Sudoku Puzzles . The Logic Testing Books for Adults 12+

📕 Don't be afraid because even if the puzzles are very hard, you can still do them. You just have to be patient and not get frustrated easily. Remember that numbers are your friends. Solving Sudoku successfully requires a strategy, which you should have already developed by the time you tackle very hard puzzles. So go ahead and test your logic. Work on these puzzles today.