A well-constructed video game puzzle is kind of like a magic trick. The game designers need to give players all the tools they need to find the solution on their own, but if they nudge the player too far in the right direction, it takes all the fun out of solving the puzzle. Some games, like The Legend of Zelda: Ocarina of Time, get it just right. Others, like Zelda II: The Adventure of Link, do not.
Take Zelda II's Hidden Palace, for example. When you start the dungeon, you'll need the Magic Key, which unlocks an infinite number of doors, to get past the third screen. In order to get the Magic Key, you have to cast the spell Spell (yes, that's what it's called) at a dead end at the edge of the Hidden Town of Kasuto in order to uncover the Key's hiding place. To pull that off, you'll need to find the Hidden Town first—which involves chopping down trees with your hammer, because that's absolutely how forestry works—and learn Spell from a Kasuto native, and then you need to figure out what Spell does, because that name doesn't help at all (Spell also transforms some monsters into other monsters, which has nothing to do with making temples appear, adding to the confusion).
Oh, and the one hint you get to set you in the right direction? In Kasuto Town, non-hidden edition, an old man says. "THE TOWN IS DEAD. LOOK EAST IN WOODS." That's it. There's nothing about hammers, spells, hidden temples, or keys. Sure, if you're nine years old and have the time (and patience) to try everything, you might find get lucky and find your way on your own. If you're not, just check a walkthrough, then get back to the fun part: decimating Moblins and making Ganon beg for mercy.