There are different brain games sold by various video game manufacturers. It may be a bit expensive but the good news is that there are also free online games which would allow you to increase mental exercise.
All of us are attracted by Games of Puzzle but shy away from them, either because they are too difficult to solve or very demanding in their requirement of knowledge spectrum be it technical or Vocabulary. Once we get the hang of it the enjoyment we get is enormous.
How can playing computer games and other mind games help you keep your mind?