Teotihuacan: Expert Challenges is a series of setups intended to challenge players who are well familiar with the game. Book 3 contains two challenges. Book 3: Noble Challenge Representing a time in history after the completion of the Pyramid of the Sun, this challenge turns the game on its head, requiring a different approach to the game than previously. Book 3: Explorer Challenge This is a challenge for the most experienced players. With a by-the-book setup, collecting masks is usually a secondary means of gaining victory points. The Explorer Challenge promotes mask collection to a prime strategy, and it allows very high scores.