Need Help with Concentration? Play Casual Games!

I must admit, I’m a sucker for these studies about casual gaming. I mean, who would have thought that casual gaming can relieve stress, help kick bad habits, be beneficial for the disabled, improves work productivity, and now this?
According to a site, 4-ADHD.com, playing games like Tetris or Bejeweled can help improve concentration, relieves stress and promotes relaxation in children with Attention Deficit Hyperactivity Disorder.