I honestly think final fantasy 1 is the hardest and ff8 2nd hardest (still wasnt that hard) and 3rd hardest final fantasy 4 (my opinion)

When i first played final fantasy 1 i though going to be easy i was dead wrong the key is to level up and get best items (take time) you may need to also see a walkthrough if you get stuck.

From what I've heard, 5 is pretty brutal.

Original FFV

Original FFIV is second hardest

i played ff 5 truly wasnt that hard just straight forward with alot of leveling!

Final Fantasy XI

FF8 was very easy once you draw some powerful magic, FF1 was hard and FF4

dude you can cheat sooo bad in FF8..i had all the second to last weapons in the beginning of the game

Final Fantasy IV (DS) was the hardest Final Fantasy I've ever played.

yo know the the remakes were toned down The Original FF wrere hard especially 5&4