Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities first for each character to maximize their potential in battles. Don’t be afraid to mix and match different paths to create unique character builds that suit your playstyle.

For side quests, make sure to complete the Monster Arena challenges for valuable rewards and tough battles. Also, don’t miss out on the celestial weapons and aeons quests for powerful upgrades.

As for character builds, consider specializing each character in a specific role like tank, healer, or damage dealer to cover all bases in your party. Experiment with different abilities and see what works best for your team composition.

Happy exploring Spira! Let me know if you need more tips!