There are three hidden locations in the game that can only be accessed after inputing passwords in the airship's oscilliofinder, which is the giant spherical object in the cockpit of the ship. These passwords can be figured out by deciphering several Al Bhed messages spread across Spira. But for an easier alternative, just look for them here.
Note: All of the passwords are case sensitive.
Password No. 1 >> GODHAND Input the password with all capital letters. This will lead you to an area in below Mushrom Rock Road. Move north until you reach the end, and open the treasure chest to recieve Rikku's legendary weapon. Note: you must have the celestial mirror in order to open this chest.
Password No. 2 >> VICTORIOUS This password sends you on top some ruins on Besaid Island. Climb up the tree branch to find Rikku's Victorious. An armor that nullifies three types of elemental attacks.
Password No. 3 >> MURASAME This password takes you once again to the ruins in Besaid. But this time you find a treasure chest which has Auron's Murasame. The blade has the One MP cost ability which is very useful.
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