You know the mysterious pond that upgrades your boomerange and sheild, it fills magic and hearts. For magic throw in an ice or fire rod, for heats, throw in the master sword.(I only tried it with the lv 2 sword)By the way if you don't know where the mysterious pond is, go to the wishin well thing where you get more bombs or arrows, you go down in the whirpool and then you go strait up into a waterfall. And if you don't know where the wishing well is then you go to Lake Hylia and swim a way. If you don't know where Lake Hylia is, I can't help you it's too easy to find.
We have more cheats and tips for this game here, The Legend of Zelda: A Link to the Past cheats
Comments for this hint