This book features the following: - 100 puzzle grids - Large grids and print font for prevention of eye-strain - History of Sudoku - Keep Your Mind Sharp with Sudoku - Sudoku Rules of Play - The Basic Rules of Sudoku - Answers (all solutions). If you enjoy logic puzzles and other brain exercises, give Sudoku a try. Don't be afraid: numbers, yes, math, no Did you know the American Alzheimer's Association has endorsed Sudoku as a "brain game" that might help to reduce the risk of dementia as we get older?