Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities first, like HP and MP boosts, before branching out to learn new skills. Don’t be afraid to backtrack to grab important nodes you might have missed.

For side quests, be sure to complete the Monster Arena challenges for valuable rewards and tough battles. Also, don’t forget to hunt down all the Al Bhed Primers and Jecht Spheres for lore and bonuses.

When building your characters, consider their unique strengths. For example, Tidus excels in speed and agility, so boosting his evasion and accuracy can make him a deadly physical attacker. Experiment with mixing and matching abilities to create powerful custom builds tailored to your playstyle. Happy exploring!