Note: You need to obtain the Airship, Warp Cube, Rune Staff, Protect Ring (x 4), Ribbon (x 4) (Rune Staff user is a must), Judgment Staff (Suggested).

Equip everyone with a Protect Ring and Ribbon. Travel to the Flying Fortress Floor 4. Head south one screen length. Using a similar strategy as in the low-level trick, have your melee character attack, and your highest Intelligence members use the Rune Staff and Judgment Staff. Pin down X and LEFT or RIGHT, making your party walk infinitely in a straight line. If your party is too weak, the Rune staff will not be enough to keep them alive.