The Legend of Zelda: Link's Awakening/Color Dungeon

The Color Dungeon is a small yet intricate set of puzzles that you could spend hours working out if you don't notice the patterns.

First of all go to the Mabe Village library. You'll notice a book on the top of the centre shelf. Equip the Pegasus Boots and ram into the shelves, knocking the book down in the process.