If you are gamer by nature, but dislike the idea of wasting time - I have a game for you. I've spent 3 month playing it almost daily and it does makes me... maybe not smarter, but improves memory, calculation - and generally, I feel very positive impact.
This application is for mobile and consists of 12 excersizes. Some of them locket at the beginning and opens as you make progress. Here is video that shows how it looks.
I imagine I did not impress you (when my friend said that al his family plays it now I was not impressed) - but try it.
You can find this game on site SPB.com or check mobile store from your phone, they might have better price.
My today's Brain Power is 865, not brillian but not bad =) Beat me