Badges are equippable items that provide various passive bonuses and, when combined, can unleash powerful 'Badge Effects'. You can equip one badge for Mario and one for Luigi. Badges are found in treasure chests, purchased from shops, or awarded for completing specific challenges. Each badge has a 'Badge Meter' value, and as you perform actions in battle, this meter fills up. Once both Mario's and Luigi's Badge Meters are full, you can activate a combined 'Badge Effect' by pressing the 'Y' button. These effects range from restoring HP/SP, increasing stats, dealing massive damage, or even granting invincibility for a short period. Experiment with different badge combinations to find synergies that suit your playstyle. Collecting all badges and understanding their effects is key to optimizing your combat strategy, especially for tougher boss fights. Some badges are very rare and require extensive exploration.
