I'm going to take a stab at guessing this one.
I recently learned of an RPG, released in America (and I assume in other English-speaking countries), for the Genesis called Sorcerer's Kingdom, which by the way DP lists as a 5 rarity.
Now, I haven't played this game yet, but I found it interesting that despite the fact that it seems to be a traditional RPG, released in English, and on a major console, I can find almost nothing about the game online. GameFAQs has two small reviews for it, but other than that, not much at all turns up on Google. Gamespot only has TWO reader votes for the game, which is the lowest I think I've ever seen for an English game.
And to top it off, I got ZERO results by searching for the title here on the DP forums. And I thought almost every RPG ever made would have been mentioned at least once on DP, maybe in a collector's list, or in a list of obscure RPGs, or in a list of Genesis games, or something.
So I propose that Sorcerer's Kingdom is the least popular English console RPG ever.
That is why I am determined to play and master this game for no good reason.
I'll then ask to DP, have you ever heard of this game? OR can you think of any other console RPGs that are just as unknown as this one?
Here are some screens, by the way.
Truly only the elitest RPG collectors have it.