Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on each character’s strengths. Make sure to unlock key abilities like Quick Hit for Tidus and Holy for Yuna. Don’t be afraid to mix and match different paths on the grid to customize your characters’ builds to suit your playstyle.

For side quests, be sure to complete the Monster Arena challenges for some great rewards and tough battles. Don’t forget to collect all the celestial weapons and defeat the Dark Aeons for the ultimate challenges. And of course, the infamous lightning dodging mini-game in the Thunder Plains is a must for completionists.

As for character builds, consider specializing each character in a specific role like physical attacker, mage, or healer to maximize their potential in battles. Experiment with different abilities and mix up your party members to find the perfect balance for any situation. Happy exploring in Spira!