I bought this for my son because it was the youngest age available for DS (has younger grades available for ipods), he usually can do most 2nd grade brain quest games, this is more challenging but you can select 3rd grade only (or combination or 4th grade only), It is a great game-- educational but lots of fun! Love the sudoku option also. Would get a 1-2 grade one in a heart beat!
This is a great game, some of the questions are a bit difficult, but it teaches the kids. My son does not choose to play on his own though, I kind of have to make him play it, so not one that the kids will be overjoyed to play but still they are learning.