Book for Nerds - Sudoku Puzzle Book

Why should you spend time solving hard Sudoku puzzles? Because of the benefits, of course! When you solve Sudoku, you feel a sense of accomplishment that easily translates to happiness. When you solve Sudoku, your memory and logic gets a boost. And when you solve Sudoku, you get a break from your repetitive chores. Aren''t these benefits more than enough reason to get into the puzzle addiction?