Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to mix things up and experiment with different paths for your characters. Focus on their strengths and customize their grids to suit your playstyle.

For side quests, make sure to complete the Monster Arena challenges for some great rewards and tough battles. Also, don’t forget about the Celestial Weapons and the optional Aeons like Yojimbo and Anima. They can really make a difference in tough battles.

As for character builds, consider specializing each character in a specific role to maximize their potential. For example, Tidus can be a fast physical attacker, Yuna a powerful white mage, and Lulu a devastating black mage. Also, don’t neglect abilities like Quick Hit, Flare, and Full-Life for those clutch moments in battles. Happy exploring!