I've been playing this game for over a year in both its NES and GB incarnations. It's a fantastic puzzler. But I have to admit something :
I still don't really understand what conditions have to be met in order to move from one level to the next. There doesn't seem to be a clear rhyme or reason to it. Sometimes it seems like you have to get the board to a point where there are no pairs of tiles left. Other times it seems like you have to get the number of tiles to a point equal or below the value listed in the "clear" field. There has to be a clear condition to achieve here but it's just not readily apparent to me. I looked on Gamefaqs but there was only one uninformative faq for this game. So does anyone here have some insights? Thanks.