I've had this for a while now, and it rocks!, I'm not saying it's worth buying a DS for, but to those who own It's nice.
Activities such as Head Count and the Sudoku puzzles will have you using a bit more logic than others like Calculation X20/100, other than that this game will have you do several random events that will ask you to draw, remember recent happenings, that type of thing, Now the game will keep comprehensive records of you're progress in each category as well as marking the days you logged on to perform them using a stamp on the date These stamps will (once you've collected a set amount) unlock more things to do and even more variety to the experience.
I found it to be quite the best Funducation I've ever had.