Put your brain through it's paces with this Brain Gym sudoku puzzle book of 200 giant size puzzles, 100 hard and 100 very hard. Each gigantic puzzle fills the page making it super easy to read, with plenty of space for penciling in the possibilities. 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! Solutions are printed at the end of the book. 1 huge puzzle per page. 8.5 by 11".