The first part of this game (up to the Master Sword and the first Agahnim fight) was 10/10 for me, giving you clues about where to go next but never holding your hand too much, letting you explore freely to find some secrets with the items you've obtained up to that point. The remaining 2/3 of the game were overall a bit more confusing about what to do between one dungeon and another, and I had to check a guide to find some useful items in the overworld (I recommend going for 100% items and heart pieces, because in this game you take A LOT of damage in some parts, especially in the Dark World) as some stuff wasn't that clear, but apart from that every dungeon was well designed and the game in general, although pretty tough, was never unfair. I understand why it is considered a classic.