Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on each character’s strengths. For example, Tidus is great for agility and physical attacks, so prioritize those nodes for him. Auron is a powerhouse, so beef up his strength and HP.

For side quests, don’t miss the Monster Arena for fun battles and rewards. The Celestial Weapons are a must-have, so be prepared for some challenging tasks to unlock their full potential. Also, keep an eye out for Al Bhed Primers to unlock a secret language.

In terms of character builds, experiment with different paths on the sphere grid to find what works best for your playstyle. Mix and match abilities to create versatile characters. And don’t forget to customize your weapons and armor for extra stat boosts. Happy exploring!