Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on maximizing each character’s strengths. Start by following the character’s default path to unlock key abilities, then branch out to learn new skills from other sections of the grid. Don’t be afraid to backtrack to previous nodes to boost stats like HP, MP, and accuracy.

For side quests, make sure to complete the Monster Arena challenges for valuable rewards and tough battles. Don’t forget to seek out the Celestial Weapons for each character, as they pack a serious punch when fully upgraded. And of course, the elusive Ultimate Aeons are a must-have for any completionist.

When it comes to character builds, tailor your grid to suit your playstyle. For example, Tidus excels as a speedy physical attacker, while Yuna shines as a powerful healer and summoner. Experiment with different abilities and see what works best for you. Happy exploring!