Okay, I don't understand the grade system at all. It almost seems impossible to get higher than C+. Also, some of these games can be unfair, for example, the dog biscuit one. It's fine until they introduce the moving blue blocks. You can easily go to the exact position it tells you to and the blocks move in a way that ensures you're not gonna get that bone. That's pure evil. Also, after a while, yeah, it does get repetative as you'll find yourself playing the same games constantly. It's good for kids, but it's almost insulting to one's intellect, especially with the grade system.
It's a good game to test your skill within certain game categories, but after a while you get bored because it seems repetitive and get discouraged when your Brain Age grade never gets higher than C+ (I don't want to know what that says about me). My nephew was discouraged after averaging a Brain Age grade of C and although he practiced games within the practice portion, he just couldn't get into it because, according to him, "the challenge is no longer there, especially when I keep getting a C." And so, we both gave the game a break and played Scrabble.
I love the way they presented this way! It's better than Brain Age. There's more variety and better multiplayer. The graphics are interesting...in a good way! It's much more challenging to make you're way to the top than Brain Age was. I like a challenge though!