My mother has been trying to improve her memory. The things I found for memory boosting were either too hard and frustrating for her or too "kiddie" looking which was insulting to her.  She's always been a bird lover so these Picasso like bird renditions with their bright colors gives her something bright and happy to look at as art, as well as a means to exercise her memory.  She started out using five pair, but then worked her way up.  You can make this as hard or easy as you want to.  Even better, it's a way to exercise the brain without it ever feeling like a chore.  We've played against each other and found ourselves talking about the various pictures from an artistic point.  Nice conversation starter as well, and a good way to draw old stories out of someone who has memory issues.