One of my hobbies is to play Suduko on my iPad. There are 8 levels of difficulty ranging from easier more started numbers down to waft the call 'Nighmare' where there are fewer numbers to begin. For me, this helps exercise the brain as well playing it helps me to use my handicapped right hand and fingers which assists my recovery. It has also helped cure the double vision I had for a while. Beats watching the depressing news on CNN.