Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, don’t be afraid to mix things up and explore different paths for your characters. Always prioritize unlocking key abilities like Quick Hit for Tidus and Holy for Yuna.

For side quests, make sure to complete the monster arena challenges for some great rewards and to unlock the legendary weapons. Don’t forget to hunt down all the Al Bhed Primers for some extra lore. And of course, the celestial weapons are a must for taking on the toughest bosses.

As for character builds, focus on maximizing each character’s strengths. For example, boost Auron’s strength and HP to make him a powerhouse on the battlefield, and invest in Lulu’s magic skills to deal massive damage with her spells. And always remember to customize your armor and weapons for that extra edge in battle. Happy exploring!