Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. Make sure to prioritize unlocking key abilities and stats that complement their natural abilities. For side quests, don’t miss out on the Celestial Weapons – they are super powerful and worth the effort to obtain. Also, make sure to complete the monster arena challenges for some great rewards. As for character builds, experiment with different paths on the sphere grid to customize your party members to your playstyle. Whether you prefer physical attacks, magic, or support abilities, there’s a path for everyone on the grid. Happy exploring!