Hey fellow Final Fantasy X adventurer! When it comes to sphere grid progression, don’t be afraid to mix things up and experiment with different paths for your characters. It’s a good idea to focus on each character’s strengths to make them more effective in battle.

For side quests, make sure to complete the Monster Arena challenges for some great rewards and tough battles. Don’t forget to collect all the celestial weapons for your party members too! They can really give you an edge in tough fights.

As for character builds, consider specializing each character in a specific role like tank, healer, or mage. This way, you can cover all your bases in battles. And don’t forget to use key spheres to access different sections of the grid for more versatility. Happy exploring!