There are many hard dungeons in the series but after beating the games over and over I get used to them and nowadays they aren't a problem anymore. Except one! The Dragon (=Level 6) in LoZ (first quest). Even with all the upgrades availabel at the time I always die i the one room near the beginning wit the red and blue wizzrobes, the bubbles and the like likes. The only itemes I have at this point in the game that deal damage are my sword, bombs, arrows and the candle. The candle can only be used once so it's more or less useless, the bombs are hard to time and I only have a few of them, the arrows I don't like to use because I know I'll need the rupees to buy myself a new shield, because I know one like like will get me and eat my old one. So I only can use my sword but evertime I touch a bubble I'm helpless because now I can't even use my sword for a few seconds. And I can't even just ignore the enemise because in order to go to the next room I'll have to kill every of them except the bubbles. And not to mention once my shield is gone I can't protect my self from the magic of the wizzrobes. That is the reason why the Dragon is imo the hardest dungeon of all