Hey there, fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on each character’s strengths. For example, Tidus is great for agility and speed, so prioritize those nodes for him.

Don’t forget to unlock key abilities like Quick Hit and Ultima for powerful attacks. As for side quests, be sure to complete the Monster Arena challenges for valuable rewards and boss battles.

For character builds, experiment with different paths on the sphere grid to customize your team to your playstyle. Whether you prefer a balanced party or specialized roles, there are plenty of options to try out. Happy exploring!