Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. Customize your grid to enhance their unique abilities – like magic for Yuna, strength for Tidus, and agility for Wakka. Don’t be afraid to branch out to neighboring paths for versatility.

For side quests, don’t miss out on the Celestial Weapons – they are powerful and worth the effort to unlock. Monster Arena battles are a great way to level up and earn rewards. And don’t forget about capturing monsters for the Arena!

As for character builds, experiment with different paths on the grid to see what works best for your playstyle. Mixing and matching abilities from different paths can create powerful combinations. And always prioritize HP and MP nodes to keep your party strong in battles. Happy exploring!