Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip would be to focus on each character’s strengths and customize their paths accordingly. Don’t be afraid to mix and match different abilities to create unique character builds.

For side quests, definitely don’t miss out on the Monster Arena challenges for some great rewards and tough battles. The Celestial Weapons are also a must-have for endgame content, so make sure to complete the side quests to unlock them.

As for character builds, experiment with different combinations of abilities to see what works best for your playstyle. Don’t forget to level up your characters evenly to ensure a balanced party.

Happy exploring, and may Yevon guide your journey in Spira!