Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to take your time and plan ahead. Focus on unlocking key abilities for each character first before branching out to other areas. Also, make use of the ‘Expert Sphere Grid’ option for more flexibility in customizing your characters.

For side quests, be sure to complete the Monster Arena challenges for valuable rewards and tough battles. Don’t forget about the Celestial Weapons quests for ultimate weapons and the optional Aeons like Yojimbo and Anima.

In terms of character builds, consider each character’s strengths and roles in battle. Tidus excels in speed and agility, so focus on agility nodes and quick hit abilities. Auron is a powerhouse, so prioritize strength nodes for him. Experiment with different abilities and mix and match to find the best combinations for your playstyle. Happy exploring!