This is a pretty solid game. It has a simplistic concept for each mini game, but perfecting them in execution is hard. This game could either make you feel very smart or very dumb depending on which mini games are your strengths and weaknesses. I had the hardest time doing a good job with the multitask one. I have never been great at doing more than a few things at one time, especially if it takes a lot of concentration.
Still, I would have liked to see a larger variety of mini games in this game to test different areas and to stimulate your brain more. Perhaps even having a difficulty setting that progressively gets harder the better you get with each challenge. That way it will feel like you are improving at a more natural pace. Regardless of how hard some of these games are, I still think this was a great idea for a game, nonetheless. It could use more work in other areas, but I give it props for the areas it excels in. It very much reminds me of Brain Age for the Nintendo DS actually and I thought that game was solid. Love to see more games like this in the future because it's great playing games that make you feel like you are working your brain and having fun at the same time.