I will be doing a teleseminar with Martin Walker who brought the dual n' back game to the web at Mind Evolve. Mind Evolve uses a strategy which has research behind it, and it appears that the more you use the tool, the better you get at it. That's right, no top end to the training. I just purchased it, and have used it five times, and I will keep right on going with it. It is addictive and fun to use. Mike Logan