Mind Games is a great collection of games based, in part, on principles of cognitive psychology to help you practice different mental skills. The perfect game to help you fight the effects of aging on your brain, or try to improve brain functioning at any age. This app includes a handful of free games. Additionally, there are a number of trial games included that can be played 3 times. All games include your score history and a graph of your progress. Using some principles of standardized testing, your scores are also converted to a standardized scale so that you can see where you need work and excel.