Sudoku

Put your brain through it's paces with this Brain Gym book of 400 Hard Sudoku puzzles, perfect for the more experienced player. We exercise our bodies but our brains need a workout too Sudoku helps keep your brain healthy and functioning well. Challenge yourself to finish all the puzzles without cheating This book contains solutions to all the puzzles. 140 pages, 4 puzzles per page. 8.5 by 11."