Jumbo Sudoku Puzzle Challenge Vol 3: Jumbo Sudoku Challenge EditionPaperback, 3 March 2016

As an adult, it may not be an uncommon to feel like you are doing something that's redundant. You have settled on career path so you are naturally exposed to problems of the same kind. As a result, some part of your brain stagnates and to keep them going again you need a good logical brain game like Sudoku. Play a puzzle today!