Heh, I think I posted this ages ago and didn't get an answer. It's so silly, but I still can't figure it out. On the screen where you first visit Bowser's Castle, there is a moat of lava around the castle, and on the other side to the left of the entrance there's a sort of hill with a red ? block on top. Later, you drain the moat of lava. But I still can't get over there! It won't let me just jump into the empty moat from the bridge or the "shore"--there's a barrier there. If you follow the moat to the right it continues onto another screen but there's no way down there either. If I could get into the moat, I could get the badge--but I can't find where you go to get into the moat. And what badge is in that block anyway? I've long since finished the game, but that badge is going to drive me insane. . . .