Do a Sudoku to stay sharp!
I have been doing Sudoku for years at lunchtime. I normally spend 25 to 30 minutes on the Fiendish or Super Fiendish versions. I will normally finish one in three of them in this timescale. I hear you ask- What benefit do you get from doing it?
There are a host of benefits which I have experienced:
The research about the benefits of Sudoku are mixed. According to a recent Article in August 2017 in CNBC News there seems to be proof of clear benefits.
“Taking a stab at Sudoku is another working-memory training activity. It’s like chess — while you’re making a move, you have to think three or four steps ahead to your next move. And that’s good exercise for the brain” ( Source : https://www.nbcnews.com/better/health/can-coloring-or-playing-sudoku-really-boost-your-brain-power-ncna761031)
The advice is that you need to combine brain exercises with good diet and regular exercises. So it’s not a replacement to healthy living but it could just be part of it