Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my top tip is to focus on each character’s strengths. Don’t be afraid to specialize them in specific roles like damage dealer, healer, or support. Use key spheres wisely to unlock important abilities early on.

For side quests, make sure to tackle the Monster Arena for some epic battles and rewards. Don’t forget about the celestial weapons either – they are a game-changer! And of course, the elusive Dark Aeons are a challenge worth taking on if you’re up for it.

When it comes to character builds, experiment with different paths on the sphere grid to find what works best for your playstyle. Don’t be afraid to mix and match abilities from different paths to create powerful combinations. And always keep an eye out for stat-boosting spheres to maximize your character’s potential. Happy exploring!