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This app is free because it is a pretty basic game but does work well. Remember the game you used to play as a kid called Simon where it had 4 colored lights and would make a pattern of lights flashing and tones and you would push the buttons to repeat what it did. The patterns get longer and longer and more and more complicated with each turn. Eventually it will get to the point that it is too complicated to remember. I like this game a lot because it is challenging and I feel it is a good exercise for your brain to improve your memory skills. There are several different levels to start with (Slow, Normal, Fast and Insane) and you can choose between 4 sets of sound effects (Xylophone, Animals, Turkey, and Galaxy Wars). I like this game to keep me entertained for a few minutes or to really go at it and work on my memory skills! It is free, so might as well check it out.
Image Source: http://itunes.apple.com/us/app/i-say-free/id293891050?mt=8