Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on maximizing your characters’ strengths. Start by following each character’s natural path to unlock key abilities and stat boosts. Don’t be afraid to branch out to other paths to grab useful skills.

For side quests, be sure to complete the Monster Arena challenges for valuable rewards and the Celestial Weapons quest for ultimate weapons. Also, don’t forget to power up your Aeons through the optional battles in the temples.

As for character builds, tailor them to your playstyle. For Tidus, focus on agility and speed to make him a swift attacker. For Yuna, prioritize her magic stats to maximize her healing abilities. Experiment with different builds to find what works best for you. Happy exploring!