Fit Brains Trainer
This app comes from the same company that gave us the language learning Rosetta Stone program. As with Lumosity and Elevate, it offers a series of fun minigames, in this case designed to improve memory, concentration and other cognitive faculties. An added little bonus is the ability to compare your scores to those of other people in your area and age group, which is liable to make you feel like an intellectual god or a complete imbecile. (iOS/Android, Free with premium options)
