There are a myriad of collectibles to find in The Legend of Zelda: Skyward Sword HD, from familiar items like pieces of heart to brand-new trinkets like Goddess Cubes and Gratitude Crystals. The latter are especially valuable; you'll often receive them after helping the residents of Skyloft with their problems, and you can trade them in for bigger wallets and other helpful rewards.
Nearly every character in Skyloft has some sort of side quest for you to complete, including Instructor Owlan in the Knight Academy. Here's what you need to do to complete Owlan's quest and earn his Gratitude Crystals. We also have a ton of other Skyward Sword HD guides in our roundup, including heart piece and Goddess Cube locations. Be sure to check those out before you set off on your adventure.
