Think you?re smart? Prove it! Twenty-five brain-stumping IQ quizzes, featuring wordplay, diagrams, numerical challenges, and more, provide an intriguing challenge. Here?s just one sample of what?s in store: Solve the clues to find four six-letter words. The same three letters are represented by XYZ in each word. X Y Z clue : fleet X Y Z clue : heat X Y Z clue : beguiles X Y Z clue : remove defensive capabilityAnswer:2. Armada, warmth, charms, disarm.