Just like the games that have taken the mature gaming market by storm in Japan, Brain Age ($20) is hitting stores here in the US. Through the use of a series of tests, the game gives you an initial "Brain Age" — the approximate age of brain based on how well it works. Afterwards, by performing exercises every day you can begin to lower your "age" and stimulate your brain, hopefully making up for all the damage it receives on your weekly drinking binge.