Today I discovered Lumocity which is a well developed site to improve "brain power" like:
Is this the best site of its kind? Are there any other recommended tools to improve our ability to remember and solve problems?
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see this website for introduction to Dual N-Back brain training. this software is for the PC, for iphone/ipad, use IQ Boost, which is free also.
A lot of the brain power comes by repetition. I am a Lumosity user for quite some time and in my opinion it is one of the best. However it's only effective if you keep training your brain on a regular basis. I tried some other apps and stuff, also on my Android, but Lumosity to me is the most fun, motivating and it has some nice graphs & tools for analysis.