Which Final Fantasy was the most difficult?

[Wolf Kanno]

Statuses stay after battle in most games, though, and II actually had more statuses that didn't than I.

I recall playing games where some would disappear after the fight is over, and that wasn't the case in II. I also had to run quite a way just to get to a town where I can do anything about the status effect, and I don't remember if I ever found a cure or anything. I can't even remember what the status effect was, but it was annoying.

You didn't start having full recovery of status magic after battle until FFVII. The first six games kept all statuses on a character until properly healed.