This article is from the Final-Fantasy and other Square Soft Games FAQ, by firstname.lastname@example.org (Nick Zitzmann) with numerous contributions by others.
Congratulations! Many of the early to late copies of the game have a bug
in them known mainly as "Relm's Sketch Bug". If you sketch certain
enemies late in the game, especially invisible enemies or any of your
characters who appear on the other side of the screen (ie Gau), this can
It is highly recommended that you do not sketch any enemies late in the
game, because there are certain side effects to the bug. You can get
lucky and win 255 Atma Weapons, Gem Boxes, Excaliburs, etc. but if
you're not so lucky, all your saved games may just be erased.
Be careful with this one, and find the FakeMustache as soon as possible.