The whole Castlevania series can be difficult in various spots, but nothing quite offers the same level of ludicrous challenge as Castlevania III. See, the game gets tough enough thanks to some utterly ridiculous challenges, but the North American version also was modified so the player takes more damage. So while this title has some of the best music, visuals, and even level design of the NES trilogy, it's also the one that will tick you off the most.