Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on unlocking key abilities for each character first before branching out. This will help you maximize their potential early on in the game.

For side quests, make sure to complete the Monster Arena challenges for some great rewards and tough battles. Don’t forget to visit the Cactuar Village and unlock the legendary weapons for your party members by completing the chocobo race and dodging lightning bolts in the Thunder Plains.

As for character builds, experiment with different paths on the sphere grid to customize your party members to suit your playstyle. Whether you prefer Tidus as a speedy physical attacker, Yuna as a powerful summoner, or Auron as a tanky powerhouse, there are endless possibilities to create the ultimate team. Happy exploring!