From popsci.com:

Games and puzzles have a long history of “teasing” your brain so that it gets bigger and badder, and eventually smarter. Lumos Labs, a San Francisco-based cognitive neuroscience research company, recently released a series of games—under the title Lumosity—designed to improve a whole gamut of brain functions.

…
If you want to try some of Lumosity’s games, Popsci.com has three you can play right now (for free!). Speed Match works on attention and memory; Word Bubbles improves vocabulary; and Memory Matrix beefs up the part of your brain in charge of remembering names, the locations of objects, and reasoning.

Source

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