Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my advice is to focus on unlocking key abilities and stat boosts for each character first before branching out. Make sure to use your spheres wisely and plan your route carefully to maximize your character’s potential.

For side quests, don’t miss out on the Celestial Weapons and Aeons like Yojimbo and Anima. They can be powerful additions to your party. Also, consider completing the Monster Arena challenges for valuable rewards and the chance to test your skills in battle.

When it comes to character builds, it’s important to specialize each character based on their strengths. For example, Tidus excels in agility and speed, while Auron is a powerhouse in physical attacks. Experiment with different abilities and see what works best for your playstyle.

Happy exploring in Spira! Feel free to share your own tips and tricks too.