Hey there, fellow Final Fantasy X explorer! When it comes to sphere grid progression, my top tip is to focus on each character’s strengths. Make sure to prioritize upgrading key stats like HP, MP, strength, defense, and agility. Don’t spread your points too thin – specialize your characters to make them really shine in battle.

For side quests, don’t miss out on the Celestial Weapons – they’re super powerful and worth the effort to unlock. Also, keep an eye out for hidden Aeons and legendary monsters for epic battles and rare rewards.

When it comes to character builds, experiment with different paths on the sphere grid to customize each character to your playstyle. Whether you prefer heavy hitters like Tidus, magic users like Yuna, or support characters like Wakka, there’s a build that’s perfect for you. Have fun exploring Spira and mastering the sphere grid!