Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, remember to prioritize 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 awesome rewards and tackle the Celestial Weapon quests for ultimate gear. When it comes to character builds, focus on each character’s strengths – Tidus for speed and agility, Auron for brute strength, and Yuna for magic. Experiment with different paths on the sphere grid to create unique and powerful builds for each party member! Happy exploring!