A pinball RPG. Yeah, you heard right. And before we lose you, there's also three standard-type games to choose from.
Chilling in the ending scene's sprite bank is an older version of the stoppers/AT symbols used in RPG mode.
The (unused and used) stopper graphics both use three colors, with the older ones saying '1 2 3' and the used ones saying '1 F P'. In-game, both the text and stopper graphic are always white, rendering the lettering effectively invisible.
There are unused Japanese characters/words left in some of the latter graphics banks.
There's some katakana that was obviously removed from the US version, though it remains in that version's ROM. The copyright statement was also changed, necessitating a removal of the Jaleco logo.
An intro for the RPG mode was added to the US version, showing the king and queen being kidnapped, before dropping the player into the game.