Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to mix and match different paths for your characters to make them versatile in battles. Focus on upgrading key abilities first before branching out to other nodes.

For side quests, make sure to complete the Monster Arena challenges to unlock rare items and powerful Aeons. Don’t forget to explore every nook and cranny for hidden items and secrets – you never know what you might find!

As for character builds, tailor them to your playstyle. For example, Tidus can be a speedy physical attacker, Yuna a powerful White Mage, and Lulu a devastating Black Mage. Experiment with different combinations to find what works best for you. Happy exploring!