Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, be sure to focus on each character’s strengths. Don’t be afraid to mix and match different paths to create unique character builds. For side quests, don’t miss out on the Celestial Weapons and capturing all monsters for the Monster Arena. As for character builds, consider specializing each character in a specific role like tank, mage, or healer to optimize your party’s effectiveness in battles. Happy adventuring!