Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to branch out and experiment with different paths for your characters. It’s important to prioritize key abilities like haste, protect, and curaga early on.

For side quests, make sure to complete the Monster Arena challenges for some great rewards and tough battles. Also, don’t forget about the Celestial Weapons and the Dark Aeons for the ultimate challenges.

As for character builds, think about each character’s strengths and weaknesses. For example, Tidus is great for agility-based builds, while Lulu excels in magic. And don’t forget to mix and match abilities to create well-rounded characters for any situation. Happy exploring!