Worlds group together several quizzes designed to help you progress step by step within a single topic. Each World contains a sequence of quizzes that you must complete in order.
When you finish all the quizzes in a World, you receive an XP bonus as a final reward. The amount of XP depends on the World: some give +100 XP, while others offer even more depending on their difficulty and length.
Your progress is saved automatically, so you can return anytime and continue learning without losing anything.
