Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities like Quick Hit for Tidus, Holy for Yuna, and Mug for Rikku early on. Don’t be afraid to backtrack to grab important nodes or switch characters’ paths to customize their builds.

For side quests, make sure to complete the Monster Arena challenges for awesome rewards and tough battles. Also, don’t miss out on the Celestial Weapons quests for ultimate power! And remember to keep an eye out for Al Bhed Primers to unlock the Al Bhed language and secrets.

When building your characters, consider specializing them based on their strengths. For example, turn Tidus into a speedy powerhouse, Yuna into a versatile mage, and Auron into a tanky damage dealer. Experiment with different paths on the sphere grid to find the best combinations for your playstyle. Happy exploring!