Legend of the River King GB

Catch at least one of each type of fish before catching the guardian. Then the phrase "Funland Unlocked" will appear after the credits. Restart the game and stay at the inn on level 1 to reach level 5. It contains an inn and a small lake that contains every type of fish

To play music while fishing:

1. Pull out your fishing pole (but don't cast yet).
2. Push A and go to the tools menu.
3. Once there go to Memo, then to Fishing record.
4. Exit and the music for that level will start playing, even when you have your line out.