Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities and stat boosts for each character’s designated role. Don’t be afraid to mix and match different paths to create a unique character build.

For side quests, make sure to complete the Monster Arena challenges for valuable rewards and AP. Also, don’t miss out on the Celestial Weapons and Aeons quests for some powerful upgrades.

In terms of character builds, consider specializing each character in a specific role like tank, mage, or support to maximize their potential in battles. Experiment with different abilities and equipment combinations to find what works best for your playstyle.

Happy exploring Spira! Let me know if you need more tips or have any questions.