What are your thoughts on brain games, puzzles, etc? I understand that the brain can be compared to a muscle (in a sense) and when you exercise it, it grows stronger. I recently downloaded lots of (mostly free) brain game apps and puzzles, as well as Donalee Markus' DSM exercises. I know that the studies are not pointing out that these games make changes in the brain, but I'd like to think that if something like juggling can make changes, why can't something like Sudoku or chess?