Hey there, fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. For example, Tidus is great with agility and speed, so prioritize upgrading those nodes for him.

Don’t forget to unlock key abilities like Quick Hit and Hastega early on to make battles easier. As for side quests, don’t miss out on the Celestial Weapons and Aeons quests for some powerful rewards.

When planning character builds, consider mixing and matching different paths on the sphere grid to create versatile and well-rounded characters. Experiment with different strategies to find what works best for your playstyle. Happy exploring!