Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities and stat boosts for each character. Don’t be afraid to branch out to other paths to make your characters well-rounded. For side quests, don’t miss out on the celestial weapons and their corresponding side quests for powerful upgrades. Also, completing the monster arena challenges can yield great rewards. When building characters, consider specializing each one to excel in different roles like physical damage, magic casting, or support. Experiment with different paths on the sphere grid to find the best builds for your playstyle!