I just saw that today. Not only is the game quite rare, I've never seen it with the box and the instructions before! My friend asked me if it was the silver box, it was, but I don't know why, I guess there is another version of the game? Strictly speaking, I would never pay 20$ for that game. But considering I can't find it on ebay, can't find it on Amazon Japan, can't find it on
Yahoo auctions ...