nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqaw2gcqz09z6lq5w5thzcadjsy8n7srs8mczkgs4c5rvjyyfh96ns5sk0gr (nprofile…k0gr) That's one of the great Nintendo classics - there are 100 levels (I think I'm remembering that correctly), and it gets better as you go along.
The battery is replaceable, if you have basic soldering skills. Definitely worth it.