600 Sudoku Puzzles Hard & Extra Hard: Active Brain Series Book 8

Active Brain Series bumper book of 600 Sudoku puzzles with solutions. With 300 hard and 300 extra hard puzzles. Sudoku is a fun way to exercise your brain and there are plenty of puzzles in this book to give it a really good workout! The book is 8.5" by 11" and has 4 puzzles per page.