Many people believe that intelligence is genetically innate. We cannot become smarter. There is evidence that this belief is false. You can enhance your intellect via training. In early 2008, a group of researchers at the University of Michigan presented evidence that a dual N-Back game that used both spatial and audible features could be used to enhance working memory and fluid intelligence (see Jaeggi et al, 2008). As the players achieved higher levels of difficulty in the game their score on an intelligence assessment test increased. The players each trained for around 25 minutes a day, and the more days they trained the more their fluid intelligence improved. Fluid intelligence is closely related to the ability to learn new cognitive tasks.
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The best version of the game, called Mind Builder, is available on the iPhone, iPod Touch, and iPad. You can get it here The web-based version unfortunately doesn't work in all browsers and it requires Flash.
You can find a version of the game that has been modified to be more fun as a web game here.
You can find the "traditional" version of the game here here, but the difficulty increases much faster.