Want to train your brain? Lumosity may be the perfect app for you. Developed by neuroscientists, Lumosity is already used by over 60 million people around the world. Just as you might head to the gym to exercise your body, Lumosity provides a way for you to exercise your brain. Every day you get three free games or you can subscribe to access more. The games are based on the idea of neuroplasticity, which says that your brain can grow and learn when challenged. Lumosity is available for both the iOS and Android platforms.