Hardest: FFX/Star Ocean 3
Worst: Um... FFX-2
I cannot beat one of the last bosses on FFX and it is driving me utterly insane! As for Star Ocean 3, Im stuck Ive been stuck in this dungeon for almost 2 weeks now...
And FFX-2 was absolutely horrible. Square must have been high while thinking of this one, because all they did was take characters, tear them appart, then glue them together, only to tear them appart again.