Pottermore truly is an exploration into the world of Harry Potter. Each chapter of each book has been rendered into Flash-based paintings that can be explored, zoomed into, and clicked on. Navigation bars above, below, and to the side lets you know what you can read about and explore and move through, taking you to pages and pages of backstory, behind the scenes information, and expanded encyclopedia-like entries of just about anything you could think of.
It's also something of a scavenger hunt. You must collect items ranging from Harry's alarm clock to the cupboard under the stairs to a vial of unicorn blood. Along the way you collect chocolate frog cards of various wizards through history, and books filled with spells and knowledge of the wizarding world.