Luminosity and other brain-training games claim to be able to. I just prefer not having to be lied to when signing up for their subscription. They said on the subscription page that the payment would be taken out of my bank account on a recurring basis of $3-4/month only to discover the next day that they had taken out the gull amount! Not very ethical business practices, IMO.

I don't think there is much real evidence to support the impact of brain games on your brain's general function. This article is from one of the leading science journals in the world and provides a nice summary: http://news.sciencemag.org/brain-behavior/2014/10/neuroscientists-speak-out-against-brain-game-hype

HI loui, the short answer is no - there is no proof. It's a scam (see the article below). If you do choose to join, look out for the auto renewel feature as they will keep on charging you with no notice and no reciept