- Sudoku puzzles are a proven method for keeping the mind healthy and combating Alzheimer\'s and Dementia - Hours of entertainment - Puzzles are in size 20 font, so that you will never suffer from eye-strain while doing them - Format easy to use and to take everywhere (6x9 paperback) - Perfect gift for that special someone. - Sudoku puzzles are a proven method for keeping the mind healthy and combating Alzheimer\'s and Dementia - Hours of entertainment - Puzzles are in size 20 font, so that you will never suffer from eye-strain while doing them - Format easy to use and to take everywhere (6x9 paperback) - Perfect gift for that special someone