For those of us who are......ahem.........more mature, this is a great site! I know there are times when I really "feel" my age with memory and concentration problems. These games are great and help you focus.

http://www.lumosity.com/

http://www.lumosity.com/k/brain-teasers

I used to play these daily.  Then I forgot.  rofl.  And everything else, too.  Thank you so much for the kick in the butt.  I remembered.

jd