We all know Super Castlevania IV is an amazing game. Probably one of the best Super Nintendo games ever made. I play through it at least once a month. Even right now, I'm listening to the tune that plays while you're going to/fighting Dracula.
That said, I wish the game was a bit more challenging, as I can beat it without losing a single life (EXCEPT FOR THE RARE OCCASIONS ON THE LAST PART OF THE FRANKENSTEIN STAGE). Anyway, I think someone should make a hack that increases the difficulty of the game!