Hey there, fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on each character’s strengths. Make sure to mix up their paths to learn new abilities and unlock stat boosts efficiently. Don’t be afraid to backtrack a bit to grab important nodes.

For side quests, be sure to complete the Monster Arena challenges and the Celestial Weapons quests for some powerful gear. The Butterfly Hunt minigame in Macalania Woods is a fun way to earn some rare items. Also, don’t forget about the optional Aeons like Yojimbo and Anima!

As for character builds, tailor them to your playstyle. Tidus is great for speed and agility, while Auron excels in raw power. Experiment with different abilities and see what works best for you. And most importantly, have fun exploring Spira and uncovering all its secrets!