Big brain academy for Nintendo ds.

I started playing big brain academy and my brains getting a workout from the tests. Unlike brain age this game expectd you to keep practising and then keep doing these randonised tests untill you get faster and efficent solving seemingly simple puzzles and grades you on how fast and how many correct responses you give. 

So far I just got the average c rank but ai exspect to atleast get a b or b- minimum.

 Anyone else played big brain academy or brain age?

I haven't tried it, but I did play Brain Age years ago and I haven't played it for years I think.