Topic: Best brain training game

I've been taking a break from school for a little while and I feel like I should be doing something to keep my brain at least a little bit sharp. I feel like there's a million of these brain training games out now, so I'm just curious as to which ones you feel are the best and why. I'm tempted to pick up the brain age games.

Best sticking with the Nintendo brain training games (especially Brain Age/Brain Age 2).

I've seen good results as I could remember more things in a sequences and well, it taught me how to play Sudoku better

Big Brain Academy DS is better than Brain Training/Age IMHO

Hmm I'm still undecided. Can someone break the tie.