If this is your first purchase, get SmileBASIC for $10 and don't waste the $8 for the old DSiware Petit Computer (is it even on eshop? too lazy to check). SmileBASIC not only allows you to play/design in 3D, it has tons of new features, less limitations, and sharing/download games is just as easy as entering their passcodes. No need to monkey around with pages of QR codes.