Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on moving each character towards their respective strengths. For example, Tidus excels in speed and agility, so aim to unlock abilities that enhance his physical attacks and evasion.

Don’t forget to participate in side quests like capturing monsters for the Monster Arena or unlocking celestial weapons for powerful upgrades. These quests not only provide great rewards but also add depth to the gameplay experience.

As for character builds, experiment with mixing and matching abilities from different paths on the sphere grid to create unique and versatile characters. For example, you can turn Lulu into a physical attacker by giving her strength-based abilities or make Yuna a formidable mage by incorporating black magic spells into her repertoire. Have fun exploring Spira!