Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. Make sure to unlock key abilities early on to maximize their potential. For side quests, don’t miss out on the Celestial Weapons and Aeons like Yojimbo and Anima. They can really level up your team! As for character builds, experiment with different paths on the sphere grid to create unique playstyles. Whether you prefer a physical powerhouse like Tidus or a magical powerhouse like Lulu, there are endless possibilities to customize your party. Happy exploring!