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 to other nodes. Don’t be afraid to backtrack to previous nodes to maximize your character’s stats.

For side quests, don’t miss out on the Celestial Weapons and the optional Aeons. They can be a game-changer in tough battles. Also, make sure to complete the Monster Arena challenges for some sweet rewards.

As for character builds, customize each character based on their strengths. For example, Tidus excels in speed and agility, so focus on agility nodes for him. Auron is a powerhouse, so prioritize strength nodes for him. Experiment with different builds to see what works best for your playstyle. Happy exploring!