Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on maxing out each character’s primary path first before branching out. This helps build their core stats efficiently. Don’t be afraid to use key spheres to unlock important nodes early on.

For side quests, make sure to complete the Monster Arena challenges for great rewards and tough battles. The Celestial Weapons are a must-have for end-game content, so be prepared to undertake some challenging mini-games and puzzles to unlock them.

When it comes to character builds, experiment with mixing different paths to create versatile party members. For example, you can turn Tidus into a powerhouse by combining his speed with some of Auron’s strength nodes. And don’t forget to customize your armor and weapons for that extra edge in battles. Happy exploring!