Solid brain trainer.

Just about all of the exercises are fun and work well. However, the interface is the only thing that I dont like about the app. In some exercises, the buttons are just a tad too small and the whole einstein guide is unnecessary and hurts more than helps the experience. At any rate, $3 was worth it.

Just a warning to some, the app takes up a generous 500 mB on your phone.

Unorthodox9 about Einstein™ Brain Training