This is another good idea! I got the DS for Christmas, just for this game! I wanted something mobile that I could take on vacations or short trips to visit family! I like the daily challenges. I do wish it could sinc in with the Wii Fit to track activity and other things (like a Wii Fit mobile).  One downfall.....you get the same challenges over and over.....some of the challenges don't pertain to me (I don't ride the bus...I don't drink coffee). It would be nice to have different challenges. But overall, I am very satisfied with it and love it!