Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities early on for each character to maximize their potential. Don’t be afraid to backtrack to grab important nodes to strengthen your party.

For side quests, make sure to complete the Monster Arena challenges for valuable rewards and tough battles. Don’t forget about the Celestial Weapons and Aeons quests for powerful upgrades.

In terms of character builds, tailor each character to their strengths. For example, Tidus excels in speed and agility, so focus on boosting his agility and critical hit rate. Experiment with different paths on the sphere grid to create unique and powerful builds for each party member. Happy exploring!