Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to mix things up and experiment with different paths for your characters. Prioritize unlocking key abilities like Quick Hit for Tidus and Holy for Yuna.

For side quests, make sure to complete the Monster Arena challenges for some great rewards and tough battles. Don’t forget about the Celestial Weapons and the optional Aeons like Anima and Yojimbo. They can really help in tough battles.

As for character builds, focus on maximizing each character’s strengths. For example, turn Lulu into a powerful black mage by focusing on magic nodes, and make Auron a defensive powerhouse by unlocking his strength and HP nodes. Remember, there’s no one right way to build your characters, so have fun customizing them to suit your playstyle!