Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities first for each character before branching out. Start with their main path then expand to other sections for more versatility. Don’t be afraid to backtrack to grab important stat boosts or abilities.

For side quests, definitely don’t miss out on the Celestial Weapons. They require a bit of work to unlock their full potential, but they’re worth it. Also, make sure to complete the monster arena challenges for some great rewards and tough battles.

When it comes to character builds, tailor each character to their strengths. Tidus excels in agility and speed, so focus on improving his physical attacks. Yuna is a great healer and summoner, so boost her magic stats. Experiment with different abilities to find the best combination for your playstyle. Happy exploring!