I agree that anything that exercises the brain is a good idea. I heard a doctor on the The Today show the other day say that your brain needs to be exercised as much as the rest of your body.
Now, about Suduko, I can't figure it out to save my life. My foggy brain just doesn't "get it". I can play alot of other games but can't get this one down. The other one I have a problem with is Text Twist......I can get the big words that you have to have to get to the next level but can never get the 3 letter words. Go figure?!