Goddess Cubes are ancient cubed objects left behind by the Goddess in Skyward Sword. If Link strikes one with a Skyward Strike from the Goddess Sword, it activates a Goddess Chest in The Sky. They are only found on the Surface, and there are only 27 of them in all. The rewards in the Goddess Chests range from Rupees to Heart Medals. For an easier find, Link can also use the Dowsing to find Goddess Cubes.