Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities for each character first before branching out. Don’t be afraid to backtrack to grab important nodes. For side quests, make sure to complete the Monster Arena challenges for great rewards and tough battles. As for character builds, tailor each one to their strengths – Tidus for speed and agility, Auron for raw power, and Yuna for White Magic. Experiment with different paths on the sphere grid to maximize each character’s potential! Happy exploring!