I've wanted to check this out for a long time. My wife mentioned recently that she had tried it at a friends and liked it, so I picked one up. My daughter has a DS and now it only sees games about half the time. We all use the Brain age, and the competition in the family keeps us all trying to get our ages down. Most of the exercises are simple but trying to increase the speed of the calculations is difficult. Some of the exercises are very hard.