The Legend of Zelda: A Link to the Past at IGN: walkthroughs, items, maps, video tips, and strategies ...

There is a crucial -- but entirely optional -- upgrade you can find south of the Smithy in the Light World. To get to it, you'll have to have the Hammer.

It's hard to define what makes a game a "must-play," but for open-world fans, these games definitely make the list.