For players seeking an extra layer of difficulty and unique rewards, 'Expert Challenges' are available. These challenges are typically found in specific locations or unlocked after reaching certain milestones in the game. They often involve re-fighting bosses under stricter conditions (e.g., no items, time limits), completing specific combat scenarios with perfect action commands, or navigating difficult platforming sections. Successfully completing an Expert Challenge usually rewards you with rare gear, powerful badges, or significant amounts of experience points. These challenges are designed to test your mastery of the game's mechanics, particularly your timing with action commands and your strategic use of Bros. Attacks. Don't attempt them until you're confident in your abilities and have a well-equipped team. They are entirely optional but offer some of the most satisfying gameplay experiences.
