The Riddler's 'boss fight' is less about direct combat and more about completing all 243 of his challenges. Once all trophies and riddles are solved, you'll confront him in a final Batmobile race through a series of elaborate traps. This race requires precise driving, quick reflexes, and mastery of the Batmobile's abilities. You'll need to avoid obstacles, activate switches, and outmaneuver his automated defenses. Success depends entirely on your ability to navigate his deadly gauntlet.
