I've not long bought a DS lite for me and my little boy. Never owned or played one before (borrowed a gameboy from friends when I was at School (15 or so years ago) but that's about it. Remembered I loved Mario so that's the game I bought. I seem to have completed it but can't get to world 4 or 7. Why is that? Please give details as as you can probably guess I'm not all that technically minded. Also what's the next best game like Mario Bros? Any other info would be much appreciated.
Thanks in advance