The post games in Star Ocean are usually fun but it was an extreme chore in SO4. The maze and locks they put in the way of the gamer when trying to get to the true alt boss leads me to believe that torturing the hardcores was their intention. I'm all for a challenge but that was fucking ridiculous.
I still remember and love Valkyrie Profile's post game dungeon. I was also able to beat it without a damn guide.