Whip your flabby brain into shape with brain age!
User Rating: 9.5 | Brain Age: Train Your Brain in Minutes a Day! DS
Brain Age is a truly unique and innovative creation. Through a rigorous series of simple but challenging tests you are assigned a brain age, and your goal is to lower your brain age to the optimal age of 20 through daily "work-outs." I myself got a score of 20 my first try(w00t), but there is still an incentive to play of staying sharp. Brain Age utilizes the touch screen as well as built in mic, and aside from the occasional misread number or letter, or the mic not recognizing the word "blue" for me, it functions quite well.
All-in-all, Brain Age is a bargain at $20 for the much-needed workout your brain will recieve(and by the way, it also includes Sudoku, z0mg) So stop reading this and buy it now! 
