Hey fellow FFX explorer! When it comes to sphere grid progression, focus on unlocking key abilities for each character first before branching out. Make sure to use the right spheres for each character’s strengths – magic spheres for magic users, power spheres for physical attackers, etc.

For side quests, don’t miss the Celestial Weapons – they are powerful and worth the effort to obtain. Also, be sure to complete the Monster Arena challenges for great rewards. And don’t forget about the Al Bhed primers scattered throughout Spira – collect them for a special surprise!

As for character builds, tailor each character to their strengths. For example, Tidus is great for agility and speed, while Lulu excels in black magic. Experiment with different paths on the sphere grid to create unique and powerful builds for each character. Happy exploring!