After completing the main story, Sonic Frontiers still offers plenty to do. You can revisit any island to collect missed Koco, Skill Pieces, or complete remaining challenges. Aim for S-ranks on all Cyber Space levels to unlock all Vault Keys and fully complete your collection. There are also additional story elements and character interactions that become available after the credits roll, providing further insights into the game's narrative. try out the various difficulty settings for an added challenge!
