Jajamaru Ninpou Chou (NES)

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Extra Chapter

If you clear the chapters in order, you'll unlock a hidden final chapter.

Harder difficulties and weapons

After beating the game with certain criteria, new modes and weapons shall be unlocked.

UnlockableHow to unlock
Hard ModeBeat Normal Mode.
Normal ModeBeat Easy Mode.
Unlock CleaversBeat Hard Mode in under 60 minutes.
Unlock KatanaBeat Normal Mode in under 45 minutes.
Unlock MaceBeat Easy Mode in under 30 minutes.
Unlock New BackgroundBeat Super Hard Mode.
Very Hard ModeBeat Hard Mode.

Sound Test

This can be done during the second quest of the game, the first one in which you can have the Princess Sakura as an ally. In the overworld, to the east of the Town of Inns (the first town), and south near the shoreline, there is a shop selling Eggplants for $50. Normally, you are supposed to go back to the Town of Inns and speak with the monster in the center of the town to turn it back into a human. However, if you buy an Eggplant, then use it through the item menu, you will access a sound test mode. Use the D-Pad to shift through the music, the A Button to play the music, and the B Button to exit the mode.