Hey fellow FFX explorer! When it comes to sphere grid progression, focus on unlocking key abilities like Quick Hit for Tidus and Holy for Yuna early on. Don’t be afraid to backtrack to grab important stat boosts or unique abilities. For side quests, be sure to complete the Monster Arena challenges for great rewards and tough battles. Also, don’t miss out on the Celestial Weapons quests for ultimate weapons. As for character builds, experiment with mixing different paths on the sphere grid to create versatile and powerful characters. Have fun exploring Spira!