Power Glove

The Power Glove, in Zelda II: The Adventure of Link, is found in the Swamp Palace, in Midoro Swamp, in western Hyrule. It allows Link to break blocks with your sword, permitting access to items below, above, and beside, or even just opening up otherwise impassable areas.

The Power Glove is also a great item found in the Desert Palace of The Legend of Zelda: A Link to the Past. It allows Link to lift the light-colored rocks and skulls which are scattered around the the world of Hyrule, both Light and Dark. It is upgraded later when the Titan's Mitt is obtained.