Faxanadu (NES). It played like a better Zelda 2 with much better graphics and story. None of my friends had heard of it or cared to play it. It turns out that it's part of the Dragon Slayer series of good games that never got good marketing in North America. The ones that made it across the ocean were marketed as independent games and not as part of a series. They might have gotten a mention in Nintendo Power but they never captured mindshare and you never heard about them again.